Hope you brought your swimsuit. With over 40 beaches and some of the clearest snorkelling waters outside of Hawaii, St. Thomas will give you plenty of opportunities to slather on the sunscreen. But there are attractions beyond the sandy shores. Charlotte Amalie features Danish colonial architecture and pirate legend. Check out at Blackbeard’s Castle, then work up an appetite by climbing the historic 99 Steps, constructed from the ballast bricks of 18th-century Danish ships. And plan to leave room in your suitcase for souvenirs—the capital boasts hundreds of duty-free shops.