How about a day on Virgin Gorda?
You could get off the boat, walk over to the
ferry docks and grab the next boat to VG.
Once there, catch a cab and and take your
friends and your cooler over to Savanna Bay.
There's no facilities other than a trash can
which leads to a very secluded beach.
Except on Sunday (all bets are off if you're
going to be there Sunday) you should have
the beach to yourselves.
Have fun

Mike
When the only tool you have in your
box is a hammer, everything starts
to look like a nail.