The kiddie area is amazing, so don't underestimate it entertaining your little people. My kids were the same age as yours last year and they spent almost three hours just on the kiddie tube ride. They went again and again and couldn't get over it. They had a fabulous time. There is a lazy river ride that we all went on together which was fun. Also, there is sand around the wave pool for them to play in. We never went past the wave pool and kiddie area to discover anything else, but we were truely enchanted with it!
We bring our kids life vests with us and have them put them on. There are a ton of life guards about and event the other parents are helpful. We loved this place!