Photo: Summ, CC BY-SA 3.0, via Wikimedia Commons

Florida Keys planning

Things to Do in the Florida Keys: Mile by Mile Down the Overseas Highway

The Florida Keys are a 113-mile road trip masquerading as a destination. The Overseas Highway hops 42 bridges from Key Largo to Key West, and everything you will do is addressed by mile marker: snorkeling America's first undersea park at MM 102, feeding wild tarpon at Robbie's around MM 77, touring a working sea-turtle hospital in Marathon, crossing the Seven Mile Bridge, braking for tiny Key deer on Big Pine, and landing in Key West for the sunset carnival at Mallory Square. The trick is pacing: this is one long two-lane road, and the best trips treat the drive itself as the main event.

Snorkel Pennekamp's reefCross the Seven Mile BridgeSunset at Mallory Square

Fast read

What matters first

Use this page as the practical filter before you open booking pages, maps, or official policy documents.

Next step

Book the top experiences in the Florida Keys at GetYourGuide.

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Best fit

Road-trippers who want snorkeling, fishing, and quirky roadside stops strung along one unmissable route, and travelers pairing a few laid-back Middle Keys days with the bars, history, and sunset theater of Key West.

Start here

Drive it north to south: Key Largo for the reef, Islamorada for fishing and Robbie's, Marathon for the Turtle Hospital and Sombrero Beach, Bahia Honda for the Keys' best sand, Big Pine for Key deer, then Key West. Address everything by mile marker; MM 0 is in Key West.

Skip if

You are picturing wide resort beaches. The offshore reef starves the Keys of natural surf sand, so beaches are few and small; the water life here happens on and under the water, not lying beside it.

Decision system

The planning sequence

Use the sequence below to decide how this should shape the trip.

StopMile marker / keyWhy go

John Pennekamp Coral Reef State ParkMM 102.5, Key LargoAmerica's first undersea park: snorkel trips and glass-bottom boats

Robbie's of IslamoradaMM 77.5, IslamoradaHand-feed wild tarpon off the dock, browse the open-air market

The Turtle HospitalMM 48.5, MarathonGuided tours of a working sea-turtle rescue and rehab center

Seven Mile Bridge and Pigeon KeyMM 47 to 40The Keys' signature drive, with the walkable Old Seven alongside

Bahia Honda State ParkMM 37, Bahia Honda KeyThe best natural beaches in the Keys and calm snorkeling

National Key Deer RefugeMM 30, Big Pine KeyTiny endangered Key deer at dawn and dusk

Mallory Square sunset celebrationMM 0, Key WestStreet performers and schooners at the nightly sunset ritual

Dry Tortugas National ParkFerry or seaplane from Key WestFort Jefferson and reef snorkeling 70 miles offshore

1Start underwater at John Pennekamp Coral Reef State Park in Key Largo, the first undersea park in the United States. Book the snorkel boat or the glass-bottom tour to the outer reef ahead of time; the famous Christ of the Abyss statue sits in about 25 feet of water and is the signature snorkel stop in the upper Keys.

2Break at Robbie's of Islamorada around MM 77.5: pay the small dock fee, buy a bucket of baitfish, and hand-feed the giant tarpon boiling under the dock while pelicans plot against you. Islamorada calls itself the sportfishing capital of the world, and this is also where you charter if you want to fight a fish yourself.

3In Marathon, tour the Turtle Hospital, a working rescue and rehabilitation center inside a former motel; the 90-minute guided tours introduce the patients, and booking ahead matters in season. Sombrero Beach, down its own side road, is a genuinely good free beach for the picnic stop.

4Cross the Seven Mile Bridge slowly, then double back and walk or bike a stretch of Old Seven, the restored original railroad-era span to Pigeon Key that reopened for pedestrians in 2022. It is the best free viewpoint in the Keys.

5Stop at Bahia Honda State Park at MM 37 for the sand you thought the whole Keys would have: Sandspur and Calusa beaches are the archipelago's best natural strands, and the shallow water snorkels easily. Divers and serious snorkelers should book the trip to nearby Looe Key reef instead.

6Drive Big Pine Key at dusk with your foot off the gas: the National Key Deer Refuge protects the miniature deer that wander onto the road, and the Blue Hole quarry pond has a short trail and gators. Then finish in Key West: the Hemingway Home and its six-toed cats, the Southernmost Point buoy line, Duval Street, and the nightly Mallory Square sunset celebration. With a full spare day, take the Yankee Freedom ferry or a seaplane 70 miles out to Dry Tortugas National Park and Fort Jefferson.

On the ground

The Upper Keys: Key Largo and Islamorada

Key Largo is the dive-and-snorkel capital of the chain. John Pennekamp Coral Reef State Park at MM 102.5, established in 1963 as the country's first undersea park, runs daily snorkel and glass-bottom boat trips to the only living coral barrier reef in the continental United States, with the bronze Christ of the Abyss as the postcard stop. Islamorada, a village spread across five islands, claims the sportfishing-capital title and distills its vibe at Robbie's, where feeding the tarpon takes an hour you will not forget. The History of Diving Museum at MM 83 is the sleeper stop.

The Middle Keys: Marathon and the Seven Mile Bridge

Marathon is the family-friendly middle of the chain. The Turtle Hospital at MM 48.5 has been rescuing sea turtles since 1986, and its guided tours, ending at the patient tanks, are the Keys' best wildlife encounter for kids. Crane Point preserves 63 acres of tropical hammock, and Sombrero Beach is the Middle Keys' best free sand. The Seven Mile Bridge starts at Knight's Key: the modern span carries the highway, while the Old Seven Mile Bridge, part of Flagler's original Overseas Railroad, reopened in 2022 as a 2.2-mile walking and biking path to Pigeon Key.

The Lower Keys: Bahia Honda, Key deer, and the quiet stretch

The Lower Keys are the chain's deep breath before Key West. Bahia Honda State Park at MM 37 has the beaches the rest of the archipelago lacks, calm shallow snorkeling, and the skeletal old railroad bridge as a backdrop; boat trips run from the park to Looe Key, a reef many divers rate the best snorkel site in the Keys. Big Pine Key holds the National Key Deer Refuge, home to an endangered knee-high deer found nowhere else; drive slowly at dawn and dusk and walk the short Blue Hole trail. No Name Pub is the local lunch move.

Key West and the trip beyond the road

Key West packs the density the rest of the Keys lack: the Hemingway Home and its six-toed cats, Truman's Little White House, the Southernmost Point buoy, and Duval Street. The nightly Mallory Square sunset celebration is free and worth planning dinner around; Smathers Beach is the long man-made strand for a morning swim. The trip that outdoes it all leaves from here: Dry Tortugas National Park, 70 miles west by the Yankee Freedom ferry or seaplane, where Fort Jefferson rises from water so clear the snorkeling feels staged. Ferry seats sell out weeks ahead in season; book first.

Planning traps

Mistakes to avoid

These are the small decisions that quietly derail an otherwise good plan.

1. Expecting big natural beaches

The offshore reef blocks the wave action that builds sand, so most of the Keys have little or no natural beach. Bahia Honda, Sombrero in Marathon, and Key West's man-made Smathers are the reliable sand; everywhere else, plan around boats, docks, and snorkel trips instead of beach days.

2. Underestimating the drive

Key Largo to Key West is 100-plus miles of mostly two-lane road, three and a half hours without stops on a good day, far more on peak weekends or behind an accident. Do not day-trip Miami to Key West and back; stay at least a night mid-chain or in Key West, and address plans by mile marker like locals do.

3. Skipping reservations for the marquee stops

The Dry Tortugas ferry, Pennekamp snorkel boats, and Turtle Hospital tours all sell out in season. Book those three before you lock hotels; everything else in the Keys tolerates improvisation.

Sources checked

Official and supporting references

These are the references checked while writing this page, so you can confirm live prices, dates, rules, and operating details before money changes hands.

Monroe County Tourist Development Council (fla-keys.com)Official Keys tourism guidance, mile-marker addresses, and regional breakdowns.

Florida State Parks (floridastateparks.org)John Pennekamp Coral Reef and Bahia Honda park details, fees, and concession trips.

Dry Tortugas National Park (nps.gov)Fort Jefferson access, ferry and seaplane transport, and park conditions.

US Fish and Wildlife Service (fws.gov)National Key Deer Refuge, Blue Hole, and Key deer protection guidance.

The Turtle Hospital (turtlehospital.org)Tour format, hours, and the rescue and rehabilitation program in Marathon.

Wikimedia Commons image pagesSeven Mile Bridge and Smathers Beach photo source, license, and author records.

Staying over? Compare hotels in the Florida Keys at Expedia.

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FAQ

Common planning questions

What is the best thing to do in the Florida Keys?

Get on or under the water. Snorkeling the reef at Pennekamp or Looe Key is the signature experience, with the Dry Tortugas trip from Key West as the once-per-trip splurge. On land, the walkable Old Seven Mile Bridge and the Mallory Square sunset are the two free essentials.

How many days do you need in the Florida Keys?

Four to five days is the comfortable minimum: one for the upper Keys and Pennekamp, one for the middle Keys and the Seven Mile Bridge area, and two or three for Key West, including a possible Dry Tortugas day. A weekend works only if you base in one area rather than driving the whole chain.

Do the Florida Keys have good beaches?

A few, not many. The offshore reef prevents natural sand from building, so beaches are small and scattered. Bahia Honda State Park has the best natural beaches in the chain, Sombrero Beach in Marathon is a strong free option, and Smathers Beach in Key West is a long man-made strand.

Where do you see the Key deer?

On Big Pine Key and No Name Key, inside the National Key Deer Refuge around MM 30. The tiny deer are most active at dawn and dusk; drive slowly, never feed them, and pair the stop with the Blue Hole observation trail.

Is the drive from Miami to Key West worth it?

It is the point of the trip. The Overseas Highway covers about 113 miles and 42 bridges from Key Largo to Key West, including the Seven Mile Bridge, and the stops along the way are most of the best things in the Keys. Fly into Key West instead only if you have been before or have just a weekend.

When is the best time to visit the Florida Keys?

December through April brings dry, warm high season and peak prices. May and early summer trade some humidity for better underwater visibility and fewer crowds. Hurricane season peaks August through October, when rates drop and some businesses take their annual breaks.

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