The Virgin Islands are divided politically between the United States of America (US Virgin Islands) and Great Britain (British Virgin Islands.) Depending on which one you are visiting and where you are coming from will determine what documents you need upon entry.
Love City Car Ferries, Inc. is a United States Virgin Islands car ferry company. If you are an American citizen, no passport is required for you to visit America's Paradise. Yes, we are Americans too and as such you can spend the US dollar and you can send post cards back home using the US Postal Service.
The US Virgin Islands has four major islands: St. Thomas, St. Croix, St. John, and Water Island. Each island is unique and offers its own flavor. However, what is noteworthy is the fact that just like continental America is the melting pot of the world, with residents from all major continents, the US Virgin Islands are also a melting pot, but of the Caribbean, with residents from most if not all Caribbean islands. So when you visit, you will truly have the unique opportunity of interacting with people from the Caribbean diaspora. So the food you taste, the music you enjoy, and the accents you hear are truly Caribbean.