One of the best waterparks in the U.S. Great place for all ages, as has areas for everyone. Bring your own food and drinks, as it is expensive to eat and drink there.
Wally World is great for the little ones, and they are able to go on some of the bigger rides with an adult. Be sure they can(will) walk up the hill on their own though as carrying a toddler and a raft can be a bit much. They need to follow some of the other major waterparks and get the rafts brought up to the top by conveyor.
Affiliated somehow with Pepsi, not sure if they do the can thing like Coke with elitch, but worth looking into for some extra savings.