It seems this question comes up more and more here and on the BVI Facebook groups. Someone with the expertise ought to set up a calendar where people can post water taxi reservations and how many more people can be accommodated.

My wife and I going from the BVI to St. Thomas on May 23 but we already have ferry reservations. I wonder if we can cancel? Even if we can, we'd need more than the 4 of us and a dog to make it affordable.