Around 5:00 p.m. on Poipu Beach, the green sea turtles start arriving. By 8:00 p.m., as many as 20 of them rest together on the sand, roped-off zones keeping visitors at a safe distance. It’s a nightly ritual that sums up what makes a Kauai family trip in December work so well: the island’s winter rhythm shifts to the sunny south shore, and the big experiences — whales, waterfalls, canyons — come with fewer crowds and a cooler breeze.
Every winter, humpback whales migrate to Hawaiian waters to mate and breed — and Kauai’s December boat tours put families right in their path.
A Kauai family trip in December works best when you base yourselves on the sunny south shore (Poipu area), book your big-ticket tours early in your stay to dodge weather cancellations, and accept that the north shore is for sightseeing, not swimming, this time of year. Split your stay if you want both the lush north and the calm south — but don’t try to do everything. The island’s winter pace rewards picking three or four things and doing them well.
Families
Nature Lovers
First-Time Visitors
Kauai is the rainiest Hawaiian island — Mount Waialeale ranks among the wettest spots on Earth — but December’s rain typically falls overnight, leaving daytime mostly clear for outdoor plans. Daytime highs hover in the mid 70s to low 80s, ocean temps sit between 70 and 80 degrees, and the south shore (Poipu) stays noticeably sunnier than the north. That weather pattern shapes everything below.
The six experiences that follow are ordered roughly by how you’d schedule them across a week-long trip. Each one is backed by what the research actually supports for December conditions, with the practical details your family needs to pull it off.
| Activity | Best For | Location | December Note |
|---|---|---|---|
| Whale Watching on the Na Pali Coast | All ages | Eleele (south shore departures) | Peak humpback season — book early in your stay |
| Helicopter Tour Over Kauai | Ages 5+ | Lihue or Princeville | 70% of island inaccessible by land — mid-morning flights best |
| Poipu Beach & Snorkeling | Toddlers to teens | South shore | Calm winter water; Lydgate Park safest for beginners |
| Waimea Canyon Drive | All ages | West side | Paved roads open year-round; trails may be muddy |
| Wailua River Kayak & Secret Falls | Ages 6+ | East side (Wailua River) | Guides manage pace; younger kids ride tandem |
| Mountain Tubing at Kauai Backcountry | Ages 5+ | Old sugar plantation land | Irrigation tunnels are weather-proof fun |
Here’s how each one plays out for a family in December, with the specific details that matter.
Whale Watching on the Na Pali Coast
Humpback whales arrive in Hawaiian waters every winter to mate and breed, and December marks the start of their season. Boat tours for the Na Pali Coast depart from Eleele on the south shore, and many include snorkeling stops or sunset options. Winter boat and raft tours leave from Eleele rather than the north shore, which works in your favor if you’re staying in Poipu — you’re already close to the departure point.
Book your whale watch early in your stay, not on the last day. December weather can cancel tours, and having a few buffer days lets you reschedule. The catamaran-style cruises tend to be more stable for younger kids than the smaller raft adventures, though the rafts get you closer to the water. Afternoon sunset cruises are available too, but morning trips typically have calmer seas and better light for spotting whales.
Heading into the Na Pali Coast reframed the day — the cliffs rise 4,000 feet straight from the ocean, and seeing them from the water puts the island’s scale in perspective.
Book the catamaran whale watch with a snorkel stop — the combination gives you two activities in one morning, and the snorkel break resets everyone’s mood before the return leg.
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Helicopter Tour Over Kauai
About 70 percent of Kauai is inaccessible by land, which makes a helicopter tour one of the only ways to see the interior — the canyons, valleys, waterfalls, and the Na Pali coastline from above. December’s frequent rain means waterfalls are running hard, and the greenery is at its most dramatic. Mid-morning flights offer the best visibility and the best light for photos.
Doors-off helicopters give open views and a thrill factor that older kids and teens love, while the doors-on Eco-Star model has large windows that work well for younger children who might not tolerate the wind. Tours can be canceled for weather, so book early in your stay — same logic as the whale watch. The flight paths typically include Manawaiopuna Falls (the waterfall from Jurassic Park), which tends to get even the most screen-absorbed kid to look up.
of Kauai is inaccessible by road — helicopters are the only way to see much of the island’s interior.
The doors-on Eco-Star helicopter tour is the better pick for families with kids under 10 — the large windows mean everyone gets a view without competing for the best seat.
Poipu Beach & Snorkeling
December’s surf shifts the safe swimming zones to the south shore. Poipu Beach Park has a shallow protected lagoon with lifeguards, restrooms, and parking — the kind of setup where you can let kids splash while keeping an eye from a towel. Kiahuna Beach, a short walk away, offers a longer sandy stretch but no lifeguards, so stick to Poipu Beach Park if you want the safety net.
For snorkeling, Poipu Beach works well for confident swimmers, while Lydgate Beach Park on the east side has man-made rock-enclosed lagoons that create gentle, predictable waves — ideal for toddlers and new snorkelers. Lydgate also has a huge playground and picnic tables, which turns a snorkel stop into a full morning. Check surf reports before entering the water anywhere; lifeguards at both beaches can point you to the calmest spot that day.
The evening turtle show at Poipu Beach deserves its own mention. Around 5:00 p.m. the green sea turtles (honu) start hauling onto the sand, and by 8:00 p.m. roughly 20 of them rest together. Roped areas mark safe viewing distances — the turtles are protected, and the ropes keep kids from wandering too close.
Poipu Beach’s turtle gathering peaks around 8:00 p.m. — time a beach picnic for 6:30 p.m., let the kids eat while the sun sets, and the turtles will be arriving by the time you’re ready for a post-dinner walk.
Waimea Canyon Drive
The road to Waimea Canyon and Koke’e State Park is paved and open year-round, which makes it one of the most reliable December outings. The canyon’s red soil contrasts sharply with the winter greenery — the rain that makes trails muddy also deepens the green, so the color payoff is better than in summer. Multiple viewpoints along the drive let you pull over without committing to a hike.
Hiking trails at the top can be slick and muddy in December, so pack shoes with decent grip and a light warm jacket — temperatures at the canyon rim run cooler than the coast. If your family isn’t up for hiking, the lookouts and picnic areas are worth the drive alone. The 10-mile stretch from Waimea town to the canyon lookout takes about 30 minutes of driving, but plan for 2-3 hours with stops.
Trail conditions at Waimea Canyon turn slick after rain, which is common in December. Stick to the paved viewpoints if you have toddlers or unsteady walkers — the mud can turn a short trail into a slip hazard.
Consider a guided Waimea Canyon tour if you’d rather not drive the winding road yourself — the guide handles the wheel and points out landmarks you’d otherwise miss.
Wailua River Kayak & Secret Falls
This is the one activity on the list with a clear step-by-step sequence, and it’s a full-day commitment that pays off for families with kids old enough to paddle. The combination of kayaking and hiking breaks the day into distinct chunks, which helps with younger attention spans.
The river is flat and calm, so no whitewater experience needed. Younger kids ride in tandem kayaks with an adult. Guides set the pace and point out river landmarks along the way. Book a guided Wailua River kayak tour that includes the full route.
The trail can get muddy — December rain sees to that. Wear shoes you don’t mind ruining. The guide keeps the group moving at a kid-friendly pace, and the canopy cover keeps the hike cool even at midday.
The payoff is a hidden waterfall with a pool deep enough to swim in. Pack a dry bag with lunch and towels. The mist from the falls creates rainbows on sunny days, and the water temperature is refreshing without being cold.
The whole trip runs about 4-5 hours. Kids who can handle a full morning of paddling and walking will love it; for families with kids under 6, the mountain tubing option below may be a better fit.
Mountain Tubing at Kauai Backcountry Adventures
This is the most purely fun thing you can do with kids on Kauai in December — and it’s mostly weather-proof since the action happens inside old irrigation tunnels. A jeep transports your group to former sugar plantation land, where you float through historic canals and tunnels on inner tubes. The tunnels are dark, so you wear headlamps, and the gentle rapids provide just enough motion to feel like a ride without scaring anyone.
The water temperature stays consistent year-round, and the tunnels block rain completely, which makes this a reliable backup plan if a December squall rolls through. Kauai Backcountry Adventures runs the tours, and they provide tubes, helmets, headlamps, and shoe rentals. The whole experience runs about 3 hours including the jeep ride.
Book the morning slot at Kauai Backcountry Adventures — afternoon tours can conflict with the rain that often moves in later in the day, and the tunnels are more fun when the contrast between dark tunnel and daylight is sharpest.
Where to Stay on Kauai in December
The single biggest decision for a December family trip is which side of the island to base yourselves on. The research is consistent: the south shore (Poipu) offers the sunniest weather, calmest winter water, and most family-friendly resort options. The north shore (Princeville/Hanalei) is lush and dramatic but gets more rain, and its beaches are unsafe for swimming in winter — rough surf and strong currents make them sightseeing-only this time of year.
Many families split their stay: a few days on the south shore for beach time and resort pools, then a few days on the north shore for hiking, scenery, and a different pace. The east side (Lihue/Kapaa) is a compromise — central location, more budget-friendly hotels, and access to both north and south without committing to either.
| Area | December Pros | December Cons | Best Resort for Families |
|---|---|---|---|
| South Shore (Poipu) | Sunny, calm water, lifeguarded beaches | More developed, pricier | Koloa Landing Resort — 350,000-gallon multi-tiered pool, #1 Best Hotel Pool 2025 |
| North Shore (Princeville/Hanalei) | Lush scenery, quieter, dramatic views | Rainy, rough surf, no safe swimming | Westin Princeville Ocean Resort — full kitchens, kids’ pool with waterslide |
| East Side (Lihue/Kapaa) | Central location, budget-friendly, close to airport | Rockier beaches, less resort polish | Royal Sonesta Kauai — largest single-level outdoor pool in Hawaii, free airport shuttle |
If you’re staying on the south shore, this Kauai and Big Island trip review covers how two families handled the logistics of island-hopping with kids, including resort comparisons and daily pacing.
North shore beaches in December — Hanalei Bay and Anini Beach — have large, unsafe waves and strong currents. They’re beautiful for a walk or a photo, but don’t plan on swimming. The south shore’s Poipu Beach Park has the calm winter water your family needs.
The Grand Hyatt Kauai Resort & Spa on the south shore won a Good Housekeeping 2026 Travel Award for its 1.5-acre saltwater lagoon pool with a lazy river and 150-foot waterslide — worth considering if the pool is a deciding factor for your kids.
- Base yourselves on the south shore (Poipu) for December — sunnier weather and calm winter water make beach time possible.
- Book whale watching and helicopter tours early in your stay in case weather forces a cancellation.
- Split your stay between south and north if you want both sunny beach days and lush mountain scenery.
- Skip north shore swimming entirely in December — stick to Poipu Beach Park or Lydgate Beach Park for safe water time.
Before You Go — Kauai in December
How much rain should we expect?
December is Kauai’s wet season, but rain usually falls overnight and clears by morning. The south shore (Poipu) gets significantly less rain than the north shore. Check the Hawaii state weather portal for alerts before heading out each day.
Do we need a rental car?
Yes. Public transit on Kauai is limited, and most activities require driving between sides of the island. The Waimea Canyon drive alone is reason enough to have your own wheels. Some resorts offer shuttle service to nearby beaches, but you’ll want a car for anything beyond the resort zone.
Are the resorts crowded over Christmas week?
Yes — Christmas through New Year’s is peak season on Kauai. Book accommodations and tours months in advance if you’re traveling during that window. The weeks before Christmas (early to mid-December) are noticeably quieter and cheaper.
What’s the biggest downside of a December trip?
Limited swimming options. The north shore’s best beaches are off-limits due to rough winter surf, and even some south shore spots can have strong currents on windy days. You’re trading summer’s calm north shore waters for winter’s whale migration and greener canyon views — decide which matters more to your family.
Can we see the Na Pali Coast by boat in December?
Yes, but winter swells can cause cancellations. Boat tours depart from Eleele on the south shore rather than from the north shore in winter. Book early in your stay and have a backup plan (helicopter tour or Waimea Canyon) for days when the ocean is too rough.
December on Kauai
A Kauai family trip in December isn’t about perfect beach weather every day — it’s about working with the island’s winter rhythm. The whales are here, the waterfalls are full, the canyon is greener than ever, and the south shore delivers the calm water your kids need. You trade summer’s north shore swimming for a different set of experiences, and if you plan around the weather patterns instead of fighting them, the island shows you a side that summer visitors never see.
For more on how Kauai compares to other Hawaiian islands for a family trip, this look at Lanai as a quieter alternative offers another perspective on island-hopping with kids in Hawaii.
References
Hawaii Travel with Kids. “Best Resorts in Kauai for Families.” 2025. ↗
Things to Do Kauai. “Things to Do in Kauai in December.” ↗
Milwaukee With Kids. “25 Best Things to Do in Kauai With Your Kids.” 2023. ↗
If you’re weighing Kauai against the Big Island for a winter family trip, the Kauai and Big Island trip review walks through how two families handled the trade-offs. For a deeper look at Hawaii’s volcanic coastlines, this guide to Hawaii’s black sand beaches covers the best spots on Kauai and beyond. And if you’re planning a few sunset-worthy evenings, Hawaii’s best sunset spots rounds up the island’s prime vantage points for a family-friendly end to the day.
Explore Places to Stay
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