E.E.
It sounds like your kids may be old enough to experience The Hole. It's awesome. Also the caves on Middle Caicos are cool. The beach on Middle Caicos is the most beautiful and dramatic I have seen anywhere in the world. However, it's a bit far (although I'm not exactly sure where Beaches is) and there's not much else there, except the caves. Check out tripadvisor.com for more ideas. I'm sure it would be a great holiday just staying at the resort. Just know that, like almost all islands, it's not entirely safe to walk along the roads, especially at night. (for fear of being hit by cars, otherwise, it's completely safe there). If you feel like splurging, you can hire a boat to take you out and find sand dollars and catch lobsters and cook them up on the beach. The resort may offer something like this. Have a fantastic time. I'm so jealous!