Looe Key — The Best Coral Reef Snorkel in the Continental United States

Five miles south of Big Pine Key, in 20 to 35 feet of water, sits the best coral reef snorkel site in the lower 48. Brain coral the size of small cars. A 287-foot freighter sunk as an artificial reef in 1985. And every July, an underwater music festival — yes, really — broadcast through speakers at 25 feet down.