As part of the year pass to Knott's Berry Farm, we also get entry into Soak City. There are three locations but we like the one in Palm Springs. This is a delightful place to go. There is very little traffic, the park has never been so crowded, you can't move around and it is closer to us than Buena Park.
What we really like is that it is clean. The staff spends lots of time keeping it that way. As a family, we enjoy the wave pool and the lazy river. It's enough to get really wet without all the drama of the rides. For more mature visitors, it is fun.