Agree with MissBlue! I exchange at the cambio in mulitples of $100us. Keeps the math really simple that way. Then use J's on the beach or for local bar drinks. Credit Cards with no foreign transaction fees for larger purchases. I don't try to do conversions when partying and praising jah, too much thinking. I don't track my cash spending on a daily basis since I know how much cash I started with when I leave home and I know how much I have when I return. 15 hours to lift off soooooooooooooooooooooooooooooo excited.