I know a while back, the Mexican government enacted rules not allowing the use of U.S. Dollars in Mexican businesses (resorts, restaurants, stores, etc.). Do these rule affect tipping? I don't want to tip in Dollars if it makes it hard for the employees to exchange. I can always tips in pesos, but as lazy person it's so much easier for me to bring a wad of ones to use at the swim-up bars and buffets.