Watch out for the goats. We went to the petting zoo at FW many years ago when my DD was only about 5 (she's 16 now). The goatsreally liked the tires of her wheelchair and followed her all around. It was quite funny, but she was a little freaked out by it and was not happy that we were laughing about it.
Also, we wished that we had something to wipe her wheelchair down with after that. It picked up a lot of "animal gook" from driving around the petting zoo area. That meant some of the animal gook also got on her hands when she drove the wheelchair. We had a couple of wipes, but would have prepared with more if we had thought of it.