Currency:
The Peso presently values between 9-10 Pesos to 1 US dollar. Banks generally have the best exchange rates & open at 8:30am or 9:00am, make sure you check what hours they do money exchanges. In addition there are private money exchanges or "casa de cambios" that stay open longer, offering slightly less favorable rates than banks, but the convenience of a quick transaction at almost any time of the day or night. Most casa de cambios are opened 7 days a week and can found around the Zócalo.