Experience Mt. Olympus Water & Theme Park - a Mega-Park with Slides, Rides, Coasters & Karts - indoors and out, FREE with your stay! New in 2007, Poseiden's Rage - the world's largest surf pool - producing waves up to 9 feet tall. The Park also includes an indoor and outdoor theme park with seven coasters - including Hades underground coaster, eight go-kart tracks and a huge indoor and outdoor waterpark with waterslides, lazy rivers, wave pool and adventure golf.