Dry Tortugas National Park is a spectacular cluster of seven islands that sit 70 miles away from Key West, but the only practical way to get there is by booking a half-day flight with Key West Seaplane Adventures ($265 per person), the only charter plane company licensed to fly there. During the 40-minute flight, you’ll spot marine life, shipwrecks, and an active treasure site where half a billion dollars' worth of loot has been found. Once you arrive, you can tour Civil War–era Fort Jefferson and snorkel in the reef.
4. Insider’s Tip
Published on Feb 16, 2012 as a web exclusive.