I just visited here a couple of days ago with my two young children (ages 5,3) and my nephew (14). Although we all really enjoyed ourselves, I would say that it is more enjoyable for older kids. A lot of the water "rides" the younger kids are either too small or too scared to ride on. They do have a couple of areas for little kids which was great, but it just felt like I spent a lot of time telling my kids "no, you are too little for that". We did really enjoy it though and I would recommend it. Just make sure you wear a lot of sunscreen!
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