Florida Keys Road Trip with Kids

The Overseas Highway is 113 miles of two-lane road hopping 44 islands, and the standard family mistake is treating it as a drive to Key West. It isn’t. Key West is the least kid-friendly thing in the Keys, and the best parts are the stops you pass at 55mph on your way to it.

So this runs the other way round: three days, never more than about 40 miles between beds, and Key West as an afternoon rather than a destination. Mile markers count down as you go south, which is how everything here is addressed.

The one thing that decides your day

Wind, not season. The Keys sit behind a barrier reef, and the whole appeal - clear water, visible fish, calm shallows - depends on it being calm. Under about 10 knots the water is glass and you can see thirty feet down. Over 15 and the reef trip is a washing machine, Bahia Honda goes cloudy, and the snorkeling is a waste of a ticket.

Check a marine forecast before you commit to the boat day, and be willing to swap Day 1 and Day 2. Everything on Day 2 works in wind; almost nothing on Day 1 does.

Day 1: Key Largo and Islamorada

John Pennekamp Coral Reef State Park was the first undersea park in the United States, and it protects the northern end of the only living barrier reef in the continental US. The snorkel boat is the reason to come: it runs out to the reef, drops a line, and you swim over coral heads full of parrotfish, sergeant majors and the occasional barracuda that will make somebody in your group scream through their snorkel.

Book the morning trip. Wind builds through the day here almost every day.

If your kids are too young for the boat, the park still works. Cannon Beach has a scattered replica shipwreck to snorkel over in chest-deep water you can stand up in, Far Beach is calm and sandy, and the glass-bottom boat covers anyone who would rather stay dry.

Windley Key Fossil Reef Geological State Park is twenty minutes south and completely different. Flagler’s railroad crews quarried building stone out of an ancient reef here, and the saws cut straight through fossil coral - so you walk down stone corridors and put your hand on a brain coral that was alive when this was underwater. It takes an hour, it is entirely shaded, and it is the best thing in the Keys to do in the middle of a hot afternoon. It is not open every day of the week, so check before you drive out.

Finish at Anne’s Beach, at MM 73.5. It is barely a beach and that is exactly the point with small children: the water off Lower Matecumbe is so shallow you can walk out several hundred feet and still be at knee height, warm as a bath, over a soft bottom. A boardwalk runs behind it through the mangroves. It is free, parking is roadside and limited, and it is the cheapest good hour on the whole highway.

Day 2: Long Key to Marathon

A deliberately short driving day - about 40 miles in total, all of it in twenty-minute hops.

Long Key State Park has a canoe trail through a shallow tidal lagoon where the mangrove tunnels close in on both sides and the water is often under two feet deep. Herons in the shallows, small sharks cutting across in front of the boat, and nowhere for a nervous paddler to get into trouble.

Be realistic about the rest of the park. Hurricane Irma in 2017 and Ian in 2022 took the oceanfront campground and the beach with them and there are no plans to rebuild; the Golden Orb Trail and the few remaining primitive sites have been closed for construction through 2026. There are also no boat rentals here any more and the dockage was removed - bring your own kayak or skip to Curry Hammock. Go near high tide either way; the lagoon gets very thin at low water.

Curry Hammock State Park is the fallback and, for most families, the better option: the calmest paddling water in the Keys, a shallow protected bay with the bottom visible the whole way, and boats available at the launch - though from a third-party self-serve kiosk that runs on a QR code, not from the park, so bring a phone with signal. The beach is small and rarely crowded. If you happen to be here in October, the park hosts a raptor migration count and on a good day thousands of hawks and falcons funnel down the Keys directly over your head.

End at Sombrero Beach, which is free and has the thing almost nothing else in the Keys does: mature palms giving real shade over the picnic tables. Soft sand, shallow water, a playground, clean restrooms and a volleyball court. Loggerheads nest along here in summer and you will see marked nests roped off on the sand.

Day 3: Bahia Honda, then Key West

Bahia Honda State Park is the best beach in the Keys and you have to earn it by arriving early. The park regularly hits capacity and shuts the gate by mid-morning in season. Get there at opening.

Sandspur Beach shelves so gently that children can walk a long way out in warm, clear water; Calusa Beach on the other side is calmer still. Overhead, the ruined Flagler railroad bridge arcs away with a section removed, which makes the whole place look like a film set. The snorkeling close in around the rocks is decent without being reef-quality - that was yesterday’s job.

Then it is about fifty minutes to Key West, over the Seven Mile Bridge, which is the drive everyone photographs.

In Key West, go to Fort Zachary Taylor and largely ignore Duval Street. It is the best swimming beach in town and the one locals use. The water drops off faster than Bahia Honda, which makes it worse for toddlers and considerably better for snorkeling - the rocky edges hold parrotfish and sergeant majors within a short swim of the sand. Behind the beach is the Civil War fort itself, with the largest collection of seacoast cannon in the country and cool brick casemates that make a good hour out of the sun.

Water shoes genuinely matter here. The entry is rock, not sand.

The fourth day, if you have one

Dry Tortugas National Park is seventy miles further west and needs a whole day to itself. The ferry takes two and a quarter hours each way across open water and what you arrive at is Fort Jefferson - an enormous unfinished nineteenth-century fort covering most of a small island, ringed by the clearest snorkeling water in Florida because there is no run-off and almost no boat traffic.

Three things to know before you commit. It is expensive. It books months ahead. And rough seas make that crossing genuinely miserable, so if anybody in the family gets seasick, watch the forecast and be prepared to lose the money rather than take a bad day.

Swaps and practical notes

• If it is windy, run Day 2 first. The mangrove lagoons and Sombrero Beach are sheltered; the reef is not. This is the single most useful piece of flexibility on the trip.
• Where to stay. Splitting nights between Key Largo and Marathon or Big Pine Key keeps every drive under 45 minutes. Staying in Key West and day-tripping north inverts the whole logic of this route.
• Food gets thin between Islamorada and Marathon. Every stop on this itinerary has picnic tables; almost none have a good concession. The cooler is not optional advice.
• There is very little shade anywhere except Sombrero Beach and Windley Key. Plan the middle of the day around one of them, or bring your own shade.
• Do not try this as a day trip from Miami. Key Largo alone is a reasonable day out. Key West and back is six hours of driving for one afternoon, and it is the most common way families have a bad time in the Keys.

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