Biscayne Bay stretches 35 miles along Miami's eastern edge, a shallow estuary where freshwater from the Everglades meets the Atlantic. Established as a national park in 1980, the bay protects 172,000 acres of coral reefs, mangrove shorelines, and barrier islands that form the northernmost reach of the Florida Keys.
The limestone floor sits just six feet below the surface in most places, keeping the water warm and clear year-round.
Miami boat tours Biscayne Bay trace routes that have carried commerce and settlement for a thousand years. The Tequesta people navigated these channels in dugout canoes, harvesting conch and spiny lobster from the seagrass beds. Spanish galleons anchored here in the 1500s, seeking shelter from hurricane winds. By the 1920s, land speculators dredged artificial islands from the bay floor and built waterfront estates that still line the western shore. Star Island, Hibiscus Island, and Palm Island emerged from fill operations that moved 14 million cubic yards of sand. Developers sold the lots to industrialists and film executives who commissioned Mediterranean Revival mansions with private docks.
The bay's ecology depends on the mangrove forests that fringe its edges. Red mangroves send prop roots into the tidal zone, filtering pollutants and stabilizing sediment. Their submerged root systems shelter juvenile fish, spiny lobsters, and pink shrimp. Farther offshore, seagrass meadows produce more oxygen per acre than tropical rainforest. Manatees graze the turtle grass beds between November and March, migrating south from cooler Gulf waters. Bottlenose dolphins hunt in the shipping channels, and brown pelicans dive for mullet near the mangrove islands.
Biscayne National Park remains 95 percent water, accessible only by boat. The Maritime Heritage Trail marks six shipwreck sites, including the 1878 schooner Arratoon Apcar, whose iron hull rests in 15 feet of water off Elliott Key. Glass-bottom boat tours operate from the Dante Fascell Visitor Center in Homestead, offering reef views without snorkeling gear. Private operators run cruises from Bayside Marketplace and Miami Beach Marina, following routes past the Port of Miami cargo terminals and the downtown skyline. Sightseeing itineraries highlight the celebrity estates and the Stiltsville houses, seven wooden structures built on pilings a mile offshore. Once numbering 27, the remaining Stiltsville buildings date from the 1930s through the 1960s, preserved as historic landmarks within park boundaries.
1 hr 30 min
