greed in paradise

I have spoken to 3 different people who are not very happy with these hotels that are charging in US dollars. One party reserved a hotel last May but the hotel didn't want any payment before they got here. These non American tourists received a 20 point increase in their rate because of the currency fluctuation. I thought Mexico had their own currency ? Quit ripping off the tourists or this place will die for tourism. Tourist places that get a bad reputation might never recover