Do not accept torn or damaged pesos bills. Mexican currency, damaged in any way will not be accepted by any merchants, money exchanges or banks. If somebody offers you a damaged bill, refuse to accept it.

ATM machines are all over Cancun hotel zone and there are a few in downtown Cancun City.

ATMs dispense pesos and receipts are in pesos.

It is advisable to carry lots of small bills and change because merchants never have change.