I got the bus up from Flores in Guatemala. As we got close to the border, a money changer got on board. He told everyone that they'd run out of money in the islands and as the next day was New Year's Day, we should change all our money with him including US dollars as we would only get B$1.85 to the US dollar rather than the official rate of $2. He looked like a criminal out of Miami Vice. I assumed he was lying just because his lips were moving. However, quetzales aren't worth anything outside of the country, so I changed the few I had. He tried to short change me.