Trip to Marigot Bay
Marigot Bay is beautiful. Seemingly hidden from the outside world, you have a beautiful beach, lovely restaurants and watersports at your disposal. The locals are very friendly and while they will try to make some money, they are not pushy about it and are just as likely to have a conversation with you.
I recommend renting a zodiak or a kayak an exploring the bay from water. You can also snorkel on the north side of the bay and while it is a bit silty, you can see some very cool things. We also managed to find a seahorse! Definitely check out Marigot Bay!