Here is a pic I took outside of Frontierland's Casa Mexicana in 2004. One thing I really miss about living in California is all the Hispanic influence - we actually don't have much of it in my small town in Texas.
They renovated Casa Mexicana into Rancho del Zocalo, which serves both BBQ and Mexican dishes. They closed Big Thunder BBQ Well at least it's a zoo interactive animal learning experience attraction now!
