Many parts of the Mexican Caribbean will accept payment in US dollars, so you don't necessarily need to take Mexican pesos with you on vacation. This is especially the case in All-Inclusive resorts.
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It's recommended that you buy pesos before you land in Mexico, just in case you need the cash. According to this USA Today article, the most economical way to do this is to buy pesos from your bank in the U.S. Most banks will do this for free, especially if you're not withdrawing a significant amount of money.
Credit cards are gold around these parts but it's still a good idea to bring cash along when you travel, even on an all-inclusive vacation. While you won't be paying for meals or drinks, it's a good idea to make friends with your bartender at the beginning of the trip by leaving a tip up front.
In terms of how much money you'll need to have on hand for tipping during your Caribbean vacation, bring a small amount of cash inclusive of smaller bills like 5s and 10s. Some experts recommend that you bring a total of $150 to $200 USD for tips for a 1-week stay.
They are fantastic for tacos and other fast food. With 100 Pesos, tourists can also buy ice cream, fruits, or juice from the local food markets. If they do not want to spend their money on food, they can purchase a ticket to enter Tulum ruins, Chapultepec Castle, Museo Nacional de Antropologia, etc.
Dollars or pesos? In most tourist areas in Mexico, it is acceptable to tip in either pesos or dollars, though pesos are more practical for the person being tipped. If you do tip in dollars, be sure to only tip using notes and not coins as coins cannot be exchanged.
For traveling (even on a backpacker budget) it is perhaps better to consider what 500 pesos (or $25 will buy). That is enough to rent a car for a way (minus non-specified expenses). It is also enough for dormitory accommodation in some of the cheapest hostels in Mexico City for two nights (around $8 per night).
So, how much spending money should I bring to Mexico? On a mid-range budget, you should expect to spend $110 USD ($2200 MXN) per person daily. This accounts for 3 meals a day, transportation fare, and one activity per day(tours, attractions,etc.). Add $10 USD ($200 MXN) if planning to drink alcohol.
200 Pesos: The 200-Peso note is a common one to get at ATMs and is often the largest note that market sellers and small shops will accept. It's green and is worth about $10 USD. 500 Pesos: The 500-Peso note is the largest you're likely to see. It's currently brown, but they are starting to make new ones which are blue.
Is $500 dollars enough for Mexico? The good news is, in certain parts of Mexico it's still possible to live and travel on just $500 a month! It's even possible to live in Mexico comfortably on $500 per month, as long as you plan your trip correctly.
For All-Inclusive trips we bring about 1500-2000 pesos or so for tipping per week, plus maybe another 5000 for tours, shopping, day trips-IF you will be doing any of that. I agree the best way to get pesos is once you are in Mexico, with your ATM card at an ATM.