Get tickets to see a game at Nuevo Zorrilla Stadium. If there's nothing on while you're in the area, you might like to check if the stadium offers a tour of the facilities.
When you've finished up at this sporting facility in Valladolid, why not make your way to Jose Zorilla Stadium, University of Valladolid, and Valladolid Cathedral? They're not far from Nuevo Zorrilla Stadium and also a hit with tourists.