Cambio de Dinero!!
Well, they say that you are only going to pay for the tour... then you get to the island and about every 10 steps you have to pay 10 more bolivianos to continue on the trail (which you have to do in order to get back to your boat!). Paul and I were totally out of money, and the bank was closed (actually it´s only open for about 3 hours each day!!). Finally, we found chilean pesos on us and traded them for pesos bolivianos with this chilean guy we met on the trail.