Florida Keys

The Keys are the snorkeling and diving capital of the continental U.S., home to John Pennekamp Coral Reef State Park and the only living coral barrier reef in North America. Anglers chase tarpon, bonefish, and permit on the flats and sailfish and mahi-mahi offshore.

Kayaking the mangroves, paddleboarding the shallows, and cycling the 106-mile Florida Keys Overseas Heritage Trail round out the recreation.

Winter and spring (December–April) bring warm, dry, breezy weather and the calmest seas for diving — also peak crowds and prices. Summer is hot and humid with afternoon storms but the warmest water and best visibility on settled days.

Hurricane season (June–November) carries real risk, with September and October the highest-risk, lowest-crowd months.

The reef teems with parrotfish, grouper, sea turtles, nurse sharks, and spiny lobster. The tiny endangered Key deer — a dog-sized subspecies — survives only on Big Pine Key and a few neighbors, while American crocodiles inhabit the northern Keys.

Frigatebirds, brown pelicans, and migrating warblers fill the skies; manatees graze the seagrass shallows.

Coral reef, seagrass meadow, mangrove fringe, and tropical hardwood hammock interlock in a fragile marine and island ecosystem found nowhere else in the U.S., protected by the 2,900-sq-nautical-mile Florida Keys National Marine Sanctuary. Coral bleaching from record-warm seas (water hit triple digits Fahrenheit in 2023) and disease have caused dramatic reef decline, spurring major coral-restoration efforts.

The Keys are the exposed remnant of an ancient coral reef and oolitic limestone, formed during a higher-sea-level period roughly 125,000 years ago. The Upper Keys are fossil coral (Key Largo Limestone); the Lower Keys are oolite.

The living reef continues to build a few miles seaward in the warm Gulf Stream waters.

The Calusa and Tequesta peoples lived here before European contact. Key West grew rich in the 19th century on wrecking (salvaging ships off the reef), then sponging and cigar-making.

Henry Flagler's Overseas Railroad reached Key West in 1912, an engineering marvel destroyed by the 1935 Labor Day Hurricane (a Category 5) and rebuilt as the Overseas Highway (U.S. 1) that links the islands today.

Key West's 'Conch Republic' identity is famously laid-back, artistic, and irreverent — Hemingway's home, Mallory Square's sunset celebration, and a vibrant LGBTQ+ community define its character. Cuban and Bahamian influences flavor the food, music, and architecture throughout the chain.

The Florida Keys National Marine Sanctuary regulates fishing, anchoring, and reef contact across 2,900 square nautical miles. Coral disease and bleaching have made reef restoration a defining mission, and sea-level rise poses an existential threat to these low-lying islands, already affecting roads and freshwater.

Most visitors drive the 113-mile Overseas Highway (U.S. 1) from Miami, marked by green mile markers counting down to Key West (MM 0). Key West has a small international airport (EYW). Traffic on the single highway can be heavy, with no rail and limited bus service.

Strong sun, currents, and boat traffic make ocean awareness essential — dive within your training and watch for boats when snorkeling. Never touch coral; it harms the reef and can injure you. Hurricane evacuation of the Keys is slow on the single highway — heed warnings early.

Spearfishing and lobster harvest have strict seasons and zones; many reef areas are no-take Sanctuary Preservation Areas. Anchoring on coral is prohibited — use mooring buoys.

A Florida fishing license is required for most angling, and feeding or harassing wildlife, including the Key deer, is illegal.

Reserve John Pennekamp and Dry Tortugas trips in advance. Snorkel or dive on calm-wind days for the best reef visibility, and always use reef-safe sunscreen. Watch the mile markers for navigation, fuel up before long stretches, and time your Key West arrival for the Mallory Square sunset.

Dry Tortugas National Park, 70 miles west of Key West and reachable by ferry or seaplane, offers Fort Jefferson and pristine snorkeling. The Everglades and Biscayne National Park sit just north near the mainland, and Miami's beaches and nightlife cap the drive.