When we were in Vieques in January, we noticed that any time we went to the ATM, all of a sudden there would be several other people in line behind us. We figured out the reason when our friend got through with his transaction (or so he thought) in front of us and we stepped up and there on the screen it said something about allowing another transaction. We ended our friend's transaction and were careful to finish ALL the steps in ours. The ATM we used was the one on the main street, but there are cheaper ones at the grocery store and one of the gas stations. (By the way, when we finished our transactions, the two separate couples who had "arrived" right after us just drifted off after we thoroughly finished our transaction.) Be careful at the ATM!