An undeveloped island teeming with birds, shells, and native plants is a short ferry ride away. You'll find serene lengths of beach, abandoned former military buildings, a lighthouse and a herd of gopher tortoises patrolling nearby hiking paths. You can grab a ferry here from Dolphin Landings, John's Pass, or Fort De Soto for as little as $15. Amenities: none. Best for: solitude; walking.