This Knott’s Berry Farm-affiliated water park less than 6 miles west of Anaheim features 15 acres of amenities, including a lazy river and four slides that drop riders from chambers. Families will love the ocean-themed Gremmie Lagoon and the Beach House water playground, where kids can climb and splash beneath a three-story structure. The 750,000-gallon Tidal Wave Bay wave pool is another crowd favorite.