We've driven to TL water park from Pop Century. Very simple and quick. Take a right leaving Pop, take another right at the lights(Fire station almost directly across). Stay on this road for maybe a couple miles??? I'm awful with the distances around WDW. Anyway, TL is on your right side. Can't miss it. We always take our rental car to TL as I know I'll be getting back to my hotel much quicker than waiting for the bus, plus, if you're still in damp bathing suits, those busses can be pretty chilly!