Cayo Costa State Park, Boca Grande

Cayo Costa State Park is one of Florida's best-kept secrets. The barrier island is only accessible by boat. Activities include hiking, swimming, fishing and shelling. If you go swimming, there are no lifeguards, but there is a shark named Old Henry. You can camp in tents or rent cabins for USD20 per night. There is no electricity on the island, and all supplies must be brought with you. There are bathrooms and showers. Watch for wildlife, like raccoons and wild hogs. Cabins must be reserved 11 months in advance. This place is open daily from 8 AM.