RC123 said "I prefer to rent a room at the sportsplex during public swim. Way cheaper and much easier "
The sportsplex built a hotel on the property??! Dang you learn something new everyday on eBrandon.
As for OP I think most hotels will have "party rooms" or hospitality suites. However I doubt any will let you rent their entire pool as that would be very unfair to every other paying guest. If any hotel would though, possibly the Trails West and they do have a waterslide I believe.