Mexican pesos (1 USD$ = 13.4 pesos), but Dollars and Euros are widely accepted.
As you maybe all know, the Mayian calander predicts that the world will come to an end on the 22nd of December, 2012. There is no evidence that this event will take place. 21-22nd night in December is believed to be the longest night in the year, so the Mayians believed that we would be sucked into a black hole forming in the Milky Way galaxy. You are entitled to you're own opinions, of course, but personally myself i believe that these predictions are false. We could be hit my a metoer right now that could destroy the earth, or a dangerous plague could kill most of the population. The Mayian's couldn't predict accidents. So therefore, it is more likely the world will end in 4000, which luckily is past our life time, let's just hope our grandchildrens children will be okay!