GET PESOS BEFORE YOUR TRIP TO LORETO, MEXICO
Your bank can exchange dollars to pesos before your tip. I highly recommend doing this because its a lot easier to pay for stuff in pesos rather than dollars. There are several stores/restaurants that accept credit cards, but not everyplace does.
Wells Fargo will exchange it for you and they will take about 5% compared to the current exchange rate. For example, if the exchange rate is 20 to 1 and you gave them $1000, you will get back about 19,000 Pesos or $950 worth of Pesos. Yes, 5% kind of sucks, but its better than the exchange rate each individual store/person will give you. Also, it is a lot easier to count in pesos to pesos than dollars to peso.
From 2015 to 2020 the Peso has been between 15-20 to 1.