E.W.
There are 2 of these in Dallas. The one in Fair Park is quite cheesy. Seriously, don't waste your time. The Dallas World Aquarium is AWESOME. We took our family this past Saturday and it was very nice. Caution: It was CROWDED. I would say definitely go, but go during the week.
Here's their website:
http://www.dwazoo.com/default.html