Miami to Key West Day Trip: Best Stops Along the Overseas Highway

The Overseas Highway — US Route 1 from Florida City south to Key West — is one of the great American road trips compressed into a single day: 126 miles (203 km) of two-lane road crossing 42 bridges over open ocean, connecting a chain of coral and limestone islands to a city at the end of the continent that functions by its own rules. The drive from Miami to Key West takes approximately 3.5 hours without stops — but the point is the stops. This guide covers the best places to pause, eat, swim, snorkel, and photograph along the Overseas Highway between Miami and Key West, with honest guidance on what is genuinely worth the detour and what is better left to the through-drive.

Route Overview

Best Time to Visit

Winter / Dry Season (December  April) — Most Popular

• Temperatures of 70 80°F (21 27°C); low humidity; the most comfortable driving and outdoor conditions
• Lobster mini-season in late July is the only summer exception for serious dive interest
• Book Key West accommodation and sunset cruise activities 4 6 weeks in advance

Summer (June  September)

• Temperatures of 87 92°F (31 33°C) with high humidity; afternoon thunderstorms are daily
• Hurricane season (June 1  November 30) — monitor NOAA at nhc.noaa.gov before any Keys trip; the single-road nature of the highway makes evacuation routes critical to understand
• Lowest accommodation rates along the chain; fewer crowds at most stops

Spring (March  May)

• Spring Break crowds (mid-March) make Key West particularly busy; prices spike
• April and May offer excellent conditions after the spring break peak subsides

Fall (October  November)

• Hurricane season extends through November but activity typically diminishes by late October
• Post-hurricane-season October and November bring clear skies, moderate temperatures, and significantly reduced crowds

Departure: Miami to Florida City

The Overseas Highway technically begins at the Florida City junction (US-1 south), approximately 35 miles (56 km) southwest of downtown Miami. The drive south through Homestead passes the entrance to Everglades National Park (2 miles west of Florida City on SR-9336 — worth a 1.5-hour addition if the full day's schedule allows). Fill your gas tank in Florida City — fuel prices increase and station availability decreases as you travel south through the Keys; never depart a Upper or Middle Keys town with less than half a tank.





 

Best Stops Along the Overseas Highway

Stop 1 — John Pennekamp Coral Reef State Park (Key Largo, Mile Marker 102.5)

America's first undersea park — established 1963, covering 70 nautical square miles of coral reef, seagrass meadow, and mangrove forest. For the day-tripper, this is the optimal snorkeling and glass-bottom boat stop on the Upper Keys: the park's own boat concession runs glass-bottom boat tours (90 minutes; $32 adult) and snorkel tours (2.5 hours; $35 adult) to the reefs daily, departing at 9:00 AM, noon, and 3:00 PM. The snorkel tour is the superior experience — the reef structure, the parrotfish, and the occasional sea turtle are best appreciated in the water rather than through 4 inches of glass. Reserve in advance at pennekamppark.com — tours sell out in high season.

Photography tip: Glass-bottom boat tours allow standard cameras; underwater snorkel photography requires either a waterproof housing or a dedicated underwater camera (GoPro). Rent from the park concession if needed.

Stop 2 — Islamorada (Mile Markers 73 90)

Known as the "Sport Fishing Capital of the World," Islamorada (a collection of six islands in the Upper Keys) is where the deep-sea fishing culture of the Florida Keys is most concentrated — but its attractions for non-fishing visitors are genuine. Robbie's Marina (77522 Overseas Highway) is the essential stop: the tarpon feeding platform draws enormous silver tarpon (some exceeding 100 lbs / 45 kg) that school under the dock and can be hand-fed for $3.50 (bucket of fish: $5). It is one of the most memorable wildlife interactions in Florida. The adjacent waterfront also hosts a local artists' market on weekends.

Recommended lunch in Islamorada: Islamorada Fish Company (81532 Overseas Highway) for stone crab (in season October May), conch chowder, and fresh yellowtail snapper. Waterfront seating; consistently strong quality.

Stop 3 — Long Key State Park (Mile Marker 67.5)

A quiet and genuinely beautiful stop that most day-trippers bypass in favor of more promoted destinations — Long Key's Layton Trail (1.2 miles / 1.9 km, easy) winds through a tropical hardwood hammock above a tidal lagoon with clear views of both the Atlantic and Florida Bay on the same walk. The park's swimming beach at the Atlantic side has calm, clear water and minimal crowds. Day use fee: $5 per vehicle.

Stop 4 — The Seven Mile Bridge (Mile Markers 40 47)

The most dramatic structure on the Overseas Highway — 6.79 miles (10.9 km) of two-lane bridge spanning the open Atlantic between Marathon and the lower Keys, with water visible in every direction and no land in sight from the bridge's midpoint. The original Old Seven Mile Bridge (Flagler's original railroad bridge, 1912) runs parallel to the current road bridge and is open to pedestrians and cyclists for approximately 4 miles from the Marathon end — one of the most remarkable walking experiences in Florida. Access the old bridge from the Pigeon Key Foundation parking area at the Marathon end.

Stop 5 — Bahia Honda State Park (Mile Marker 36.8)

The best beach in the Florida Keys — the Sandspur Beach and Calusa Beach areas within Bahia Honda offer powdery white sand, turquoise water, and the iconic view of the old Bahia Honda Rail Bridge (the highest of Flagler's original rail structures) from the beach. Snorkeling from the beach reaches live coral in 8 10 feet (2.4 3 m) of water — some of the most accessible reef snorkeling in the Keys without a boat. The park also offers kayak rentals and a snorkel boat concession (advance reservation recommended at bahiahondapark.com). Day use fee: $8 per vehicle.

Stop 6 — Big Pine Key and the National Key Deer Refuge (Mile Marker 30)

The National Key Deer Refuge on Big Pine Key is the only place in the world where the Key deer — a subspecies of Virginia white-tailed deer that averages 30 inches (75 cm) tall at the shoulder, the smallest deer in North America — exists in the wild. The deer are most active at dawn and dusk but can be encountered at any hour along Blue Hole Road. The refuge is free to visit; drive slowly on all Big Pine Key residential streets — Key deer are federally protected and vehicle strikes are the leading cause of mortality. The population has recovered from approximately 27 individuals in the 1950s to roughly 1,000 today as a result of protection.

Key West: Essential Stops for a Day Visit

Mallory Square and the Sunset Celebration

Every evening at sunset, Mallory Square on the waterfront hosts an outdoor street performer gathering that has been a Key West institution since the 1960s — jugglers, acrobats, trained-cat acts, psychics, and local musicians perform for the sunset crowd. The sunset itself, over the Gulf of Mexico to the west, is a genuine natural spectacle from this latitude. Arrive 30 45 minutes before sunset to establish a position.

Duval Street

Key West's main commercial and entertainment corridor — 1.2 miles (1.9 km) from the Gulf to the Atlantic — is the city's most visited street, combining bars, restaurants, galleries, souvenir shops, and historic architecture in a density that rewards even a single hour of walking. The Ernest Hemingway Home and Museum (907 Whitehead St, one block from Duval) — the Spanish Colonial house where Hemingway lived and wrote from 1931 to 1939, now home to approximately 50 six-toed cats descended from his original cat — is open daily; $16 adult.

The Southernmost Point Buoy

The red, black, and yellow concrete buoy marking "The Southernmost Point of the Continental USA — 90 Miles to Cuba" at the corner of South and Whitehead Streets is Key West's most photographed landmark. Expect a queue for the photograph in high season; the wait is typically 10 20 minutes.

Key West Butterfly and Nature Conservatory

A 5,000-square-foot (465 m�) climate-controlled glass conservatory at 1316 Duval Street — housing up to 60 species of butterflies, two resident flamingos, and a tropical plant collection. A genuinely unusual attraction for the Keys; $15 adult; 45 minutes.

Practical Driving Tips

Mile Markers: The Overseas Highway is navigated by Mile Marker (MM) numbers painted on green roadside posts — Mile Marker 0 is in Key West; Mile Marker 127 is in Florida City. Businesses throughout the Keys give their address as MM + Bayside (BS) or Oceanside (OS). Understanding this system is essential for navigating confidently.

Single-lane bridges: Several of the older bridges on the highway are one-lane in each direction with no shoulder — passing is impossible; maintain safe following distance.

Speed limits: 45 mph (72 km/h) on bridges; 35 mph (56 km/h) through residential areas of each Key. The limits are actively enforced; speeding fines in Monroe County are significant.

Cell service: Reliable in Key Largo, Islamorada, Marathon, and Key West; absent on several bridge crossings and in more remote sections of the Lower Keys. Download offline maps before departure.

Getting Around

A personal vehicle (or rental car) is the only practical way to drive the Overseas Highway — there is no equivalent public transit service along the full route. The Key West Express ferry from Fort Myers Beach provides an alternative approach to Key West (approximately 3.5 hours each way; ferries from Fort Lauderdale are less frequent) but does not serve the intermediate Keys.

Within Key West: The city is compact (4 miles / 6.4 km long) and highly walkable. Key West Transit (the local bus system) runs limited routes; the Conch Train (a narrated tram tour) provides orientation on arrival ($35 adult; 90 minutes); and a bicycle (rentable at multiple shops on Duval Street, $15 $20/day) is the ideal vehicle for the compact city.

Suggested Day-Trip Schedule

Day-trip honesty: Driving the full length, making 4 5 stops, and spending meaningful time in Key West requires a very early departure and a very late return. The itinerary above is realistic but leaves little flexibility. If possible, spending a night in Key West or at Bahia Honda and returning the following day is the superior experience.

Accommodations (If Staying Overnight)

Key West (book 4 8 weeks in advance; 3 months for holiday periods)

Mid-Keys (If Breaking the Drive)

• Cheeca Lodge & Spa, Islamorada — luxury eco-resort; deep-sea fishing charter center; MM 82
• Hawk's Cay Resort, Duck Key — full resort; marina; dolphin encounter program; MM 61

Packing Essentials

• Sunscreen (SPF 50+ mineral-based) — reef-safe sunscreen is legally required in Florida state parks (including Bahia Honda and John Pennekamp); oxybenzone and octinoxate-based sunscreens are prohibited in park waters
• Snorkel gear — mask, snorkel, fins; rental is available at John Pennekamp and Bahia Honda but personal gear is preferable for fit
• Water shoes — for rocky beach entry at some reef snorkel sites
• Water — at least 2 liters per person; the Keys heat and humidity create rapid dehydration
• Cash — Robbie's tarpon feeding is cash-only; some food trucks and smaller establishments along US-1 are cash-preferred
• Insect repellent — no-see-ums (biting midges) are particularly active near mangrove areas at dawn and dusk
• Polarized sunglasses — essential for driving across the bridges in full sunlight reflected off the water
• Full tank of fuel — fill in Florida City and refuel in Marathon; do not rely on finding fuel in the Lower Keys

Safety Guidelines

1. Reef-safe sunscreen. Florida state law prohibits sunscreen containing oxybenzone or octinoxate in all state park waters — including John Pennekamp and Bahia Honda. Use mineral-based (zinc oxide or titanium dioxide) sunscreens only. Violators are subject to citation and fines.

2. Hurricane and severe weather. The Keys' single-road nature makes evacuation logistics critical. If a hurricane warning is issued, leave immediately — do not wait for a watch to be upgraded to a warning. Clearance time for the entire Keys population can exceed 24 hours. Monitor NOAA (nhc.noaa.gov) actively when visiting June November.

3. Key deer speed limits. Big Pine Key residential speed limits of 35 mph (56 km/h) drop to 25 mph (40 km/h) in marked Key deer zones. Violations carry significant fines; striking a Key deer is a federal offense subject to prosecution under the Endangered Species Act.

4. Boat wake zones and diving flags. If snorkeling from shore or a boat at any Keys location, a dive flag must be displayed (required by Florida law). Boat operators must stay at least 300 feet (91 m) from any displayed dive flag in open water and 100 feet (30 m) in channels.

5. Dehydration. The combination of tropical heat, humidity, sun exposure on open water, and the sedentary nature of driving creates faster dehydration than most visitors anticipate. Drink water consistently — not only when feeling thirsty.

Practical Information

Photography Golden Hours

• Seven Mile Bridge at sunrise (east-facing, from Marathon end): The bridge in the first light with the Atlantic reflecting gold beneath it — arrive at the Pigeon Key Foundation parking area 20 minutes before sunrise for the full effect; virtually no traffic at this hour
• Bahia Honda old rail bridge at golden hour: Looking northeast along the arc of the original Flagler bridge from the Sandspur Beach — the structural ironwork in warm light with the turquoise water — the most photographed composition in the Middle Keys
• Mallory Square sunset: The cloudline along the Gulf horizon determines the quality — a clear, cloudless horizon produces a flat sunset; scattered cumulus clouds in the western sky produce the deep orange and red color range the square is famous for
• Key deer at dawn (Big Pine Key, Big Pine Road): The deer browse along road edges in the first 30 minutes of light; shooting from inside the vehicle avoids disturbing the animals and provides a stable camera platform