I used to live about 2 hours from this park so I had an annual pass mainly for the concerts as that's the only real reason I can find to go to this park more than once. It's a fun little place to go with the family once in a while but it's a little overpriced for what they offer (unless you're getting in on a concert night for someone you care to see.) I haven't tried their water park yet though so I can't comment on that.
I also haven't been in a few years so I don't know what they've added since I was last there as they were working on a river rapids ride at the time. For a park that is built around promoting itself as a zoo type place it really falls on it's face. The big tour of the animals is just pen after pen of animals. There's no theming to the areas. They just took open farm land, put some fences up and put some animals out there.