Try a daysail on a private charter like the 1956 wooden yawl Nightwind - good snorkeling and/or beach stops - food and drinks included - just your party of 12 on board - customized itinerary and stay in the USVI so no passport/Customs etc to deal with.

<a href="Vhttp://www.tripadvisor.com/Attraction_Review-g147404-d1464838-Reviews-Yacht_Nightwind-St_Thomas_U_S_Virgin_Islands.html" target="_blank">Vhttp://www.tripadvisor.com/Attraction_Review-g147404-d1464838-Reviews-Yacht_Nightwind-St_Thomas_U_S_Virgin_Islands.html</a>

I have no vested interest in any way in this vessel but have sailed aboard many times.