Keep in mind that the ticket price for the Argentinian side is 170 pesos now. Do not accept credit cards or any other currency. Cash - pesos only. They changed it recently and the price is still showing on the website 130 pesos. We found it out right when we arrived to the park with not enough pesos:)) Fortunately, there are a lot of taxi drivers who can exchange reals for pesos- just ask them. The rate was not favorable for us, but it was better than to go back and forth to the town ( which is about 30 min away) and exchange it there.