We took our 19 month old toddler here and even though it was fun, we were through with it in an hour and that's taking our time. For younger kiddos, I'd probably give it 2 stars b'c there's just not that much for them to enjoy. There is, however, a little playground at the end of the trails just before exiting to the gift shop. One of those cage like ones you climb into. Probably good for the "around 5" crowd.
For older kids though, I think it's great. They have these trivia/quiz stations you can stop at and learn about the various sea creatures. My toddler just didn't really get into that stuff.
I think 3and under is free. The hubby and I paid $18 each which is insanely expensive but I figured that includes my donation in there somewhere. We've been to various aquariums and this one is definitely on the small end. Cute things at the gift shop but nothing I really wanted to get for the kiddo.
If you have a kid that is old enough to engage in the trivia stations, I definitely think it's something fun to do with them. However, for young toddlers, unless they have a special interest in sea life, I'd say wait until they are older. Save that money for when you can enjoy it with them.
P.S. I think if u order online you can get a discount. I just didn't want to give my CC info out.