San Luis Potosí (State) aka: San Luis Potosi

http://en.wikipedia.org/wiki/Cave_of_the_Swallows

I lived in San Luis over the summer, and I will be the first to tell you it is amazing. Not many tourists go here, so it gives you a good taste of the culture.

San Luis is definately on my top five Mexican cities list. It has remained close to it’s colonial roots. It has some amazing colonial archetecture and the people are laid back and willing to show you around.