We took my 2 and 4 year old to Orient Bay in St Martin last month. Incredibly easy trip; everything is walkable in the main village (grocery store, cafes, ice cream, 7-10 restaurants) and we hit a different beach club every day. Stayed in an Airbnb with washer/dryer and ate in the backyard every day. Was super easy, and relatively inexpensive. Rented a car from a local company and they picked us up and dropped us off right at the terminal. We used the car very sparingly but was nice to have. Most places take USD = EURO so that helps as well.