I went to Mexico on a cruise in 1997 but I can't remember because I was only 17, do you have to change your money into Pesos when you get off the boat to shop?
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Carnival Pride 9/05/04 Second Anniversary, First Honeymoon!
If the store will accept credit cards and you feel comfortable using, this will be your best exchange rate. If it is a street vender, dollars work fine. All their prices near the cruise dock will be in us dollars.