Buy tickets to watch a game at Jatai Municipal Stadium. If there's nothing scheduled while you're in the area, you might like to check if they offer a guided tour of the facilities.
When you've finished at this Jatai sporting facility, why not check out Federal University of Goias, Juscelino Kubitschek Memorial Park, and Divino Espirito Santo Cathedral? They're near Jatai Municipal Stadium and also popular with tourists.