Knowing nothing about your likes and dislikes, my suggestions would be:

Grand Case Beach Club, which is about as close as you can get to an AI resort and yet not be an AI resort. Two beaches, water sports activities center, great restaurant serving breakfast, lunch and dinner and just a short daytime walk from your resort you will have all of Grand Case, the epicurean center of St. Martin, at your finger tips. Beach loungers and watersports are all included and rooms range from studios up to multi-bedroom fully equipped units. A full bar and beach service for drinks......only stayed there once for four nights and absolutely loved it. We did have a car which we parked upon arrival and didn't go near it again until we checked out to go home.

And my plan B:

For only three full days, a room at the Sonesta Beach Resort would be perfect. Beautiful pool and adjacent to the most visited single beach on St. Martin where you can watch the airplanes come and go all day long. Within footsteps there is virtually everything you could want in the line of entertainment - great restaurants, bars, ice cream shops, casinos, shops of all varieties and price ranges and all within easy footsteps. If the beach at Maho isn't to your liking you can walk along the golf course and about ten minutes away is beautiful Mullet Bay Beach.

Wherever you end up, enjoy yourself and I feel very comfortable saying you will definitely want to return. This island is totally addictive.....