Raging Waters, California's Largest Waterpark , ranked #3 nationally by the Travel Channel in its Top 10 ranking of US Water Parks. With over 50 beautifully landscaped acres and 36 slides and attractions, plus a sand beach, there is outRAGEous fun for guests of all ages. Grab a board and catch a wave on the new Flowrider or race for the win on the super fast Ragin? Racer. Younger guests will never tire of Kids' Kingdom and Splash Island. Whether mild, wild or in-between, all ages always have a raging good time at Raging Waters San Dimas.