I need a town in Mexico

I'm scouting for a location here. I want to set a story in a (preferably not too large) town in Mexico. It needs to be reasonably close - an hour or two's drive - to a range of hills. The hills have to be unforested, unpolluted and with prominent red rocks. As red as possible, in fact.

It would also be good if there was a particularly narrow track leading up to the hills where a vehicle might, say, plunge down a ravine, but most of all it's the red hills I need.

Thanks in advance.