I assume you are in St-Peterborough (Dutch side)
Cupecoy bay... Orient Bay (Get there early) ... Been there a long time ago, but if it's still available, you can rent a Sail boat for a island tour and go to Iles Tintamare (desert island)
You can also rent a catamaran and go to St-Bart for a day
Marigot (French Side) = Nice shopping, restaurants, etc... Jewelry is Duty Free there