Cane Garden Bay, as Zanshin says!
It's a good sail for you and an interesting taxi ride up over the hill for your friends.
It's a great bay and definitly not a city but a nice long beach. It gets touristy in the day with cruise ship passengers.
As your charter, as all charters, far too short it gets to the nitty gritty of the BVIs quickly.
Cane Garden Bay