Do any of the waterpark rides have height restrictions?

Yes, some of the waterpark rides do have height restrictions.
Must be a minimum of 48″ to ride the Wall, Wild Vortex and Storm Chaser.
Must be a minimum of 42″ with an adult or 48″ by yourself to ride the Trail Twisters, Runaway Canyon and Timber Rattler.
Must be a minimum of 42″ to ride the Cyclone Racers, River Otter, Smokies SurfRider and Ridge Runner.
Must be 36″ to ride Twisty Twig, Split Log Run and Timber Falls.