With a name derived from the Spanish word for “turtles,” it might not come as a surprise that wildlife is the main attraction at Dry Tortugas National Park. Escape to these secluded islands on a high-speed catamaran cruise from Key West, during which you can swim and snorkel with dolphins and sea turtles around the park’s coral reef, explore 19th-century Fort Jefferson on Garden Key, and learn about your surroundings from an on-board naturalist. Avid scuba divers can head to Loggerhead Reef, made famous by the Windjammer Wreck—the remains of a Norwegian ship that sank in 1907. If you like bird-watching, take a boat ride to Bush Key, a nesting site for seabirds such as sooty terns and brown noddies.