Coming from the U.K. We are freqent visitors to the U.S. so have dollars, which we are used to. Can we use them in Cancun and surrounding area? Do we need to bring pesos? Will U.S.dollars be acceptable for tips when we first arrive? What is the tipping code, for example how much to the bellman when we arrive at the hotel, in retaurants, for taxis etc. Are credit cards widely used, and which ones, Visa? Mastercard?