Cancun Hotels Kuartos Mexico Reservations made easy!: 

Money in Cancun, Mexico
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Kuartos.com on 18 October, 2007 10:42:00
 
The peso is Mexico's official currency.
Its value is in constant flux due to its dependency on the American dollar. One
American dollar is worth approximately 11.00 Mexican pesos. Master card, Visa
and American Express are widely accepted as well as traveler's checks and
dollars (only in bills).
Money exchange centers and banks to change any type of currency to Mexican
pesos (advisable when carrying cash) are found in all areas.