I'm thinking if your budget allows you to book the Voyage 480 and captain, and fly your family of four to St. Thomas, you could also handle the private water taxi. Both 'Chillout' and 'Island Time' have good reviews. Do your family a favor and opt for the private water taxi and they will handle all the logistics of travel between USVI and BVI. A sleep on board at $750 is a little pricy, so perhaps take a taxi from Soper's Hole to Sebastian's on the Beach (or other accommodations), as there is no lodging at Soper's Hole. The Voyage 480 is a great boat, with generator, air conditioning, and water maker. It also sips fuel.