St. Thomas is the gateway island of the U.S. Virgin Islands in the Caribbean Sea, best known for its beaches and snorkeling spots. The territory’s capital, Charlotte Amalie is a busy cruise-ship port. Historic buildings include a 1679 watchtower called “Blackbeard’s Castle,” in reference to the area’s pirate history. On the harbor, 17th-century Fort Christian is now a local history museum. Go shopping and sailing, snorkeling and sightseeing, or diving and dining. Enjoy the island’s world-renowned golf course, picture-perfect beaches, and spectacular nightlife.