Aboard a seaplane equipped with pontoons that allow it to rise from the sea into the air, you fly to Dry Tortugas National Park and historic Fort Jefferson. These seaplanes are able to fly at low altitude so you can spot marine life and see a shipwreck or two. When you arrive on the island, you can go snorkeling and explore the fort. Full-day, half-day and camping trips are available at varying prices. A half-day trip costs $189 per person (adult).