Marathon sits at mile marker 50 on US-1 — roughly 50 miles north of Key West, 50 miles south of Key Largo. It was built on fishing, and that DNA is still visible in the harbor, the tournaments, and the restaurants that service the charter fleet. It's less polished than Key West, more local than Key Largo, and has better snorkeling than both.
A day trip from Key West is easy — the drive is scenic and takes under an hour. Here's what to do when you're there.
The Turtle Hospital
The most educational stop in Marathon. The Turtle Hospital has been rehabilitating sea turtles since 1985 and is the only state-certified sea turtle rehabilitation facility in Florida. The 90-minute guided tours show you the rehabilitation process — the current patients, the surgical suite, the release videos. It's genuinely well-done and not preachy about conservation, which is more effective than the alternative.
Book in advance. They run a limited number of tours per day and they fill up, especially in season. Allow 90 minutes for the tour plus another 20–30 minutes for the gift shop and outdoor tanks. Book Turtle Hospital tours on Viator →
Snorkeling — The Real Reason to Come Here
Marathon is the base for some of the best snorkeling in the Florida Keys. The water clarity is consistently better than the Key West sites and the crowds are thinner:
Sombrero Reef — Part of Pennekamp Coral Reef State Park, the first underwater coral preserve in the US (established 1960). The reef is in 15–25 feet of water, well-established coral heads, and fish density that routinely surprises people who expected the Florida Keys to be degraded. The Sombrero Lighthouse marks the site. Book Sombrero Reef tours on Viator →
Thunderbolt Wreck — A 170-foot Coast Guard cutter intentionally sunk as an artificial reef off Marathon. The wreck sits in 70–100 feet of water — deep for snorkeling but popular for scuba. The surrounding reef is good for snorkeling in shallower depths nearby.
Operators based in Marathon tend to be smaller and more personal than the Key West boat tours. Look for Keys Kayak and Snorkel or Marathon Snorkel Boats — both run small-group trips to the less-visited sites. Find Marathon snorkeling tours on GetYourGuide →
Bahia Honda State Park — The Beach
Bahia Honda is consistently rated one of the best beaches in the Florida Keys — and by a significant margin, the best beach between Key West and Key Largo. The water is clear, the sand is clean, and the state park has facilities that the other Keys beaches lack.
The three main beaches: Sandspur Beach (the main beach with the iconic old bridge in the background), Caloosa Beach (quieter, better for snorkeling from shore), and Bahia Honda Channel (good for walking and wading). The nature trail is worth a short walk — it loops through a tropical hammock with birding opportunities.
There's a small entrance fee (roughly $5/vehicle). Arrive before 11am on weekends in season for a parking spot. After noon, the lot fills and they turn people away.
Where to Eat
Keys Fisheries — On the waterfront, famous for its sunset views and its lobster bisque. The menu is seafood-centric and well-executed. Key West-style without being a tourist restaurant. Order the lobster bisque and whatever's fresh that day.
Burdines Waterfront — Across from Keys Fisheries, also on the water. Better for casual lunch (burgers, sandwiches, fish tacos) with good water views. The outdoor seating catches the breeze. Kids-friendly.
Santiago's Bodega (Marathon location) — Yes, the same Santiago's Bodega from Key West. The Marathon location is locals-preferred for the original because it's less crowded and has better parking. Tapas and Caribbean fusion, order family-style.
The Lazy Dog — If you're looking for something more substantial in the evening, the Lazy Dog has been a Marathon fixture for years with a menu that works for families and couples equally.
Getting There
Drive north from Key West on US-1 (also called the Overseas Highway). The route is well-marked and follows the water most of the way. You'll cross the Seven Mile Bridge — one of the most photographed bridges in the Florida Keys, built in the 1980s to replace the original "old seven mile bridge" which now runs alongside it and is open to pedestrians and cyclists. Stop at the pull-off on the west side for the classic photo angle.
The entire Overseas Highway section between Key West and Marathon is scenic and worth taking your time on. Pull off at the rest stops — the views across the bay are legitimately beautiful.
Full day trip itinerary, booking links, and more Marathon activities — keywestondemand.com →
Common Questions
How far is Marathon from Key West and how long does it take to drive?
Roughly 45 miles north along the Overseas Highway (US-1), about 50–65 minutes at normal speeds. The drive is scenic — you're on the water most of the way, with views across the bay. Don't speed; Monroe County patrols the Overseas Highway regularly.
What is Marathon known for?
Sportfishing capital of the Keys — tarpon, bonefish, permit in the surrounding waters. The Turtle Hospital (only state-certified sea turtle rehab in Florida). Sombrero Reef (one of the best snorkeling sites in the Keys). And Bahia Honda State Park — consistently the best beach between Key West and Key Largo.
Is Marathon good for snorkeling?
Yes — better than Key West. Sombrero Reef (part of Pennekamp Coral Reef State Park) is the standout. Water clarity is better and crowds are thinner than Key West sites. Book Marathon snorkeling tours on Viator →
What can you do in Marathon in one day?
Drive up from Key West (50 minutes), stop at the Turtle Hospital (book ahead, 90-minute tour), snorkel Sombrero Reef in the late morning, have lunch at Keys Fisheries or Burdines Waterfront, spend the afternoon at Bahia Honda State Park beach, drive back. Full day but doesn't feel rushed if you start by 9am. Alternatively, split between Turtle Hospital and Bahia Honda — better with kids.