St. Croix is the largest of the U.S. Virgin Islands.   St. Croix offers a diverse experience for travelers looking for a destination that is surprisingly un-commercialized. With two picturesque towns, both lined with historic European architectural details, waterfront promenades and dazzling shops and restaurants, St. Croix delivers on relaxed charm.   Blessed with several National Parks, National Historic Sites, and ecological gems protected by the U.S. Fish and Wildlife Service, St. Croix is a green-friendly destination that appeals to outdoor adventure seekers. But don’t let the laid back pace fool you, St. Croix is also known for its most famous export: Cruzan Rum, made on St. Croix for over a century; and Diageo USVI, distiller of Captain Morgan Rum.