In Texas, school ends in May and starts the 2nd week of Aug.
Try staying in Tha Havana area on a Vista or Excel?
And, even as a mom, I can't stand to be in a hot tub full of children. I never got in the hot tub on our last cruise and if I did it would have probably been on serenity. The few times that one of our kids would go in the hot tub my husband would sit in there with her.