You will have a wonderful trip. Orient Bay is excellent and there is plenty to do. Over the years we've discovered that the most relaxing trip is simply finding a spot on the beach at Club O and just hanging there our entire trip. However, since this is you first trip, I recommend renting a car and exploring the island a little. Marigot has a nice market and Gran Case has some of the best restaurants in the Caribbean. You've got to try Bistrot Caraibes.