The U.S. Virgin Islands offer a rare mix of tropical beauty, cultural depth, and easy access for American travelers—no passport required. From bustling St. Thomas to wild St. John and historic St.

Marooned in the Caribbean Sea is a trio of islands where no U.S. passport is required: the U.S. Virgin Islands of St. Thomas, St. Croix, and St. John. The latter is also the smallest of the three, ...