United States Virgin Islands Cruise Ship Tracker – The U.S. Virgin Islands are a group of Caribbean islands and islets. A U.S. territory, it’s known for white-sand beaches, reefs and verdant hills. St. Thomas island is home to the capital, Charlotte Amalie. To the east is the island of St. John, most of which comprises Virgin Islands National Park. St. Croix island and its historic towns, Christiansted and Frederiksted, are to the south.