We'll be there that week as well with our kids 9(DD) and 7(DS).
We booked at 11 months, but my brother and SIL just booked their 1 bedroom yesterday and got it no problem, I was so relieved.
It is a fabulous time to go, we've been a few times that week, including this past June.
You'll get an activity sheet when you check in, look it over and see what you want to do, and what the kids want to do, there is a ton of stuff each day to choose from.
You can do kayaking(we don;t because I am afraid of sharks

), there is basketball, shuffleboard, ping pong, bikes-we always rent bikes, it's a lot of fun.
They have arts and crafts, and fun educational things like a beach nature walk(we always do that one) or learning about dinosuars(the kids loved it) or dolphins or alligators. There's a pool party on Thursday, campfires a few times a week.
You can be as bust or as lazy as you want there, it is our favorite place to be.