3. U.S. Virgin Islands

Shari shows you around the lively port Charlotte Amalie and historic Fort Christian, then takes you aboard a sleek Atlantis submarine, from which you can view the sea’s teeming marine life. In St. John, hike through a lush tropical wilderness and comb tranquil beaches. Snorkel along the underwater trails near Buck Island and, on the subdued island of St. Croix, explore a restored sugar plantation.