Decide how much money you want to exchange. Separate the money you want to exchange from your other funds, so that you don't exchange more than you need.
Convert your American money at Mexico City International Airport if flying into the capital. There are several exchange booths at the airport. According to Mexperience.com, the rates at these exchange booths are among the most competitive in the country.
Look for a "casa de cambio." Casa de cambio roughly translates to "exchange house." These are currency exchange storefronts where you can convert your American dollars to pesos. If you have the time, check the rates at a few different locations. The exchange rate can sometimes vary from place to place.
Exchange dollars for pesos at your hotel. Like most hotels, you're not going to get the best exchange rates. You'll pay a higher price simply because of the convenience factor. But if you're in a pinch, converting your American money at a hotel can tide you over until you can get to a casa de cambio.
