The national currency of Mexico is the peso, its exchange rate, in relation to the dollar, fluctuates from day to day (usually just a few cents).
Visitors may exchange money or traveler checks at any bank of at any money exchange house. Anyhow keep in mind, that U.S. dollars are accepted everywhere and there are ATM's all over the State specially in touristic areas (look for a sing that reads "Cajero Permanente") they will dispense bills in pesos. You can easily withdraw money from your U.S. account, but the money will be delivered to you in pesos. (Rest assured that during your visit to Baja California U.S. dollars will be widely accepted, altough figuring out pesos bills and coins will definitively complete your vacation in México as a foreing Country).
Most commercial establishments accept Mexican and international credit cards, such as Master Card, Visa and American Express some will accept also travelers checks. Personal checks are not accepted.
