I can only recommend you a few stuff. First of all, rent a car! You can drive around the island in less than hour and you have some beautiful landscape on the way, and you can get around easier. Amongst things to do: Sunbathing at Orient bay (love that beach!!!), very lively. If you want to avoid the naked people (there is nudist colony at the southern end of the beach but people love to take a walk along the beach), Baie Rouge is as beautiful . Marigot has some upscale shopping, have a drink in one of the bars of marina Port-La-Royale, go visit Fort-St-Louis in Marigot and have a better view of the island and the other islands surrounding St-Martin, eat at grand case, see the planes on aproach at Maho Beach, shop in duty-free Philipsburg, go to the Butterfly farm...
If you go to my site, I talk extensively about St-Martin but you can also go to
[url]http://www.sxmfriends.com/6/ubb.x?a=cfrm&s=6126044112 [/url]. it's a St-Martin dedicated board. But if you browse in the reviews on this site, I am sure you can find a lot.