Deciding between St. Lucia and St. Thomas for a late July or early August vacation. Our son is 15 and daughter 19. We like 4 or 5 star resorts within walking distance of shops/restaurants and on the beach. We want to be close to activities such as ziplining, horseback riding, boat tours, and any type of adventurous tour. We like to go out on a tour everyday and don't like to sit on the beach for hours at a time. The last few years have been challenging to plan because the kids like to go off on their own for a few hours. (Hawaii and cruises were great for them) What area of St. Lucia would be safe for them to walk around on their own?