National-Park

Annaberg is where the history of these islands becomes concrete. The ruins of a Danish sugar plantation - windmill tower, boiling bench, slave quarters, factory - stand on a hillside above Leinster Bay with an interpretive trail through them, and the National Park Service does not soften what happened here. The windmill tower is climbable and the view runs across to Tortola and the British Virgin Islands. Cultural demonstrations of baking, weaving and cooking run on some days. It takes under an hour, is mostly shaded, and gives context to a trip that is otherwise all beaches.

Biscayne is almost entirely water, which means the visitor centre is a starting point rather than a destination - the park proper needs a boat. Concession-run snorkel trips go out to patch reef in the bay where the water is warm and generally calmer than the outer reef off Key Largo, and there are glass-bottom and island cruises for families not swimming. From shore you get a short boardwalk, a jetty and a good view across the bay, which is worth an hour but is not the park. Trips are weather-dependent and cancel often, so build slack into the plan.

Buck Island was one of the first marine areas in the world given national monument protection, and access is strictly through licensed concession boats out of Christiansted - you cannot simply turn up. The underwater trail runs through a barrier reef of elkhorn coral in a lagoon, with signs on the seabed, and the fish density inside the reef is far beyond anything reachable from a beach. Most trips also stop at Turtle Beach on the island’s west end, a stretch of empty white sand. The crossing takes about half an hour and can be bumpy. Full-day trips include lunch and more swimming time.

Canaveral is the longest stretch of undeveloped coast left in Florida, protected because it borders the Kennedy Space Center. Standing on the sand with nothing built in either direction is a rare thing on the Atlantic side of this state. Loggerhead, green and leatherback turtles all nest here, and the park runs guided night walks in June and July that are worth planning a trip around. Mosquito Lagoon behind the dunes is famous for paddling and fishing. Facilities are minimal, the beach can close entirely for launches, and the surf is real Atlantic surf rather than Gulf calm.

San Cristóbal is bigger than El Morro and less visited, which makes it the better of the two if your children want space to roam. It covers twenty-seven acres of layered defences built to protect San Juan from land attack, connected by tunnels that are open to walk. The detail that lands with most visitors is in a small dungeon room, where someone imprisoned here centuries ago drew ships on the wall in charcoal - they are still there. Rangers give talks through the day. The same ticket covers El Morro, so most families do both, though not usually on the same day with young kids.

El Morro guards the entrance to San Juan Bay and has done since the sixteenth century. Six levels of ramps, tunnels, gun positions and the round garitas that appear on every Puerto Rico souvenir make it genuinely fun to explore rather than merely educational - children treat it as a castle, which it is. The enormous green esplanade in front of it is where San Juan families come to fly kites on windy afternoons, and vendors sell them at the gate. Your ticket also covers Castillo San Cristóbal a mile away, the larger of the two. Shade is limited on the upper levels.

Fort Christiansvaern is the bright yellow Danish fort on the Christiansted waterfront, and it is small enough to see properly with children in under an hour - ramparts, cannon, the powder magazine, and the punishment cells below. The surrounding historic site includes the old Danish customs house, scale house and West India Company warehouse, where enslaved people were sold, and the interpretation does not avoid that. Around it Christiansted itself is compact and walkable with arcaded streets and a boardwalk. Boats to Buck Island leave from the harbour here, which makes it easy to combine.

Cinnamon Bay is a long stretch of sand inside the national park with more room to spread out than Trunk or Maho, and enough wave action to be fun for children without being rough. A small cay sits offshore within easy snorkelling range for stronger swimmers. Behind the beach a short self-guided trail loops through the ruins of a Danish sugar plantation, with the mill and estate house walls standing in the bush - a genuinely interesting half hour that puts the island’s colonial history somewhere children will actually encounter it. Watersports rentals and a campground operate on site.

Getting to the Dry Tortugas is most of the experience - two and a quarter hours by ferry across open water, or a seaplane if the budget allows. What you arrive at is Fort Jefferson, an enormous unfinished nineteenth-century fort covering almost an entire small island, surrounded by water clear enough to see the coral heads from the walls. Snorkelling straight off the beach is the best in the state because there is no run-off and almost no boat traffic. Bring everything you need; there is no shop, and the ferry leaves on schedule with or without you. Rough seas make the crossing genuinely unpleasant, so watch the forecast.

Hawksnest is the first national park beach on the north shore road and the easiest to reach, with parking essentially on the sand rather than down a trail. Three patches of elkhorn coral sit close inshore, near enough that a child who can swim thirty metres is over reef, and the bay is usually calm. It is smaller and narrower than Trunk Bay and has fewer facilities - restrooms and grills, no snorkel rental - but it is free where Trunk is ticketed, and far less affected by cruise ship days. Sea grape trees give reasonable shade along the back of the beach.

Honeymoon Beach sits on the Caneel Bay side of the national park and is reached either on foot by the Lind Point Trail from Cruz Bay - about a mile and a half, thirty to forty minutes, with real elevation change - or by water taxi. That walk is what keeps the numbers down, and it is also the thing to plan around: it is hot, exposed in stretches, and longer than it sounds. The bay is sheltered and shallow with good snorkelling along the rocks at either end, and there is a concession renting kayaks, paddleboards and floating mats with a bar and grill attached - unusual for a national park beach and very convenient with children. The trail is easy but has some uneven sections and heat, so carry water for the walk.

A staircase of waterfall-fed pools dropping through the Kipahulu district of Haleakala National Park all the way to the sea. Swimming in the pools is prohibited - flash flooding funnels down this gulch with almost no warning and a rockslide closed the pools outright - so treat this as a viewpoint, not a swim stop. The half-mile Kuloa Point Trail loops from the visitor center out over the pools and the ocean cliffs, and the four-mile round-trip Pipiwai Trail climbs past a bamboo forest to 400-foot Waimoku Falls. It is the far end of the Road to Hana, so budget the drive.

The Anhinga Trail is the single best half mile of wildlife watching in Florida and it takes under an hour with a stroller. The boardwalk runs over Taylor Slough, a permanent water hole that in the dry season becomes the only water for miles - so alligators stack up in it, anhingas dry their wings on the rails, herons stalk the edges and soft-shell turtles cruise underneath. Everything is visible from a safe boardwalk at close range, which makes it work for toddlers who cannot walk far. Vultures are known for damaging car rubber in the lot; the park supplies tarps.

Salt River Bay carries two distinct things at once. It is a national historic park because this is the single confirmed place where a Columbus landing party came ashore on territory that is now the United States, and it holds significant Taíno archaeology. It is also a bioluminescent bay, and guided night kayak tours run out into it around the new moon, when the dinoflagellates light up under the paddle. The mangrove estuary is protected and calm. Like every bio bay the experience is entirely moon and weather dependent, so book early in a trip to leave room to try again.

Shark Valley is the most reliable alligator viewing in Florida and the least effort required to get it: a flat paved loop where the animals sun themselves directly beside and sometimes on the path, close enough that the rangers spend their day telling people to back up. You can ride it - bike rentals are at the entrance, and fifteen miles is a lot for a small child, so consider riding partway out and back. The tram does the full loop with a narrating guide in two hours. At the halfway point a concrete observation tower gives a view over sawgrass to the horizon. Dry season concentrates wildlife at the remaining water.

Trunk Bay is the beach that appears on every US Virgin Islands poster, and unusually it earns it. The underwater trail is the reason to bring children: a marked route over the reef with plaques anchored to the seabed naming the corals and fish as you pass, in water shallow and calm enough that a competent young swimmer can follow it without stress. Facilities are unusually good for the national park - showers, restrooms, snorkel rental, a snack bar. It is the busiest beach on St. John, so cruise ship days are worth avoiding entirely; check the Charlotte Amalie schedule before choosing your day.

A small first-come campground at 6,800 feet in Haleakala National Park, in an experimental forest planted with pine, cedar and eucalyptus that smells nothing like the rest of Maui. The practical reason families camp here is sunrise: you are already above 6,800 feet, so the 3am drive up from sea level in the dark becomes a fifteen-minute one. The nature trail behind the campground is one of the better spots on Maui to see native honeycreepers. Nights are near freezing, which catches most visitors off guard.

An oceanfront campground in the Kipahulu district of Haleakala National Park, on a grassy bluff above the surf at the end of the Road to Hana. Camping here turns the notorious Hana drive from a rushed day trip into two relaxed days, and it puts the Pipiwai Trail and the Oheo Gulch pools a short walk from your tent, hours before the tour vans arrive. Facilities are minimal: pit toilets, picnic tables, grills, and no potable water at all. Bring every drop you plan to drink.

The main drive-up campground in Hawaii Volcanoes National Park, set in a grove of tall eucalyptus and ohia at around 4,000 feet. Staying inside the park is the whole point: you can drive out to the Kilauea overlooks after dark to see any active glow without a two-hour round trip from Hilo or Kona, and be back at the tent in fifteen minutes. A small number of simple cabins have historically been available alongside the tent sites. It is genuinely cold at night by Hawaii standards, and rain is common.

Watching the sunrise from the 10,023-foot summit of Haleakala volcano is one of the most extraordinary experiences in Hawaii. The crater landscape looks like Mars and the sunrise above the clouds is genuinely life-changing. Kids are awed by the alien-looking terrain and the cinder cones inside the massive crater. It is very cold at the summit (often below freezing at dawn) so bundle up. Sunrise reservations are required and sell out months in advance. Short rim trails at the summit are accessible for families.