There is a half court area next to the parking area. The hoop is on wheels. During past visits at non-peak times they have scheduled basketball activities for guests. You will need to check the activity schedule for times.
The basketball court on the outer road near the parking lot. We had to pass it if we walked on the outside to building 19.
My girls did a kids basketball activity one afternoon that was not on the schedule. There is balls to borrow from the same spot where you rent bikes, have to leave your room card to get the bike.