Dude, the Ft. Worth zoo is awesome IMO. Of course, I only have the dallas zoo to compare it to. But still, that's where my wife and I go from time to time. Actually, that's where I asked her to marry me!! It's one of our favorite places now!
Go to the parakeet cage, it's sweet too. They give you a popsicles stick with food and they fly all around you and land on you and eat the food. Cool stuff man.
Edit: I just visited your website for fun, I had a red eared slider named speedy!! I was like 9 at the time, but still awesome.