A cypress swamp in Everglades National Park
Florida has the third largest National Park in the lower 48 States (after Death Valley and Yellowstone) at Everglades National Park. There's some beautiful seashores preserved at Canaveral and Gulf Islands, a couple of old Spanish forts at Castillo de San Marcos and Fort Matanzas... and some beautiful Florida Keys stuff at Dry Tortugas and Biscayne National Parks. Fort Caroline commemorates an early French Huguenot settlement in the Jacksonville area that was wiped out by the Spaniards very early in Florida's European history. Timucuan and Big Cypress are essentially biological and cultural preserves, saved before the modern forces of development got there and destroyed the last remnants of Florida-as-it-was before the Spanish first arrived so many years ago.