Actually there is a $10 "port fee" charge at ST. Thomas by the USVI which is added to the quoted ferry charge. In the April session of the BVI Assembly a bill was passed adding a new $10 "environment fee" to enter which will also be added to the ferry fare but I am not sure when that goes into effect. Together that makes the ferry cost between $55 and $65 one way. (BTW that "environment fee" is applical to all arrivals by air or water but not to the hordes of cruise ship passegers.) In addition there is the $20 departure "security fee" to leave.