The exchange between Colombian pesos and the American dollar usually stays around 1,800 CPO to 1.00 USD. To do the exchange between Colombian pesos and American dollars, take the Colombian price, chop off three zeros then divide by two. To get a sense of how much most things will cost, let's say that an average ride from the airport to most common destinations is usually about $25.000 ($12.50). Most martinis cost $20.000 ($10.00), and a nice dinner out with wine usually comes to about $80.000 ($40.00) per person. Find a cash machine is very easy in Bogota. There are several. If possible, use a cash machine located inside a shopping mall or a buisness. They are usually safer.
We recommend that you bring your debit and credit cards, and use one of the many ATM's everywhere to get pesos. It's always better to try to walk around with the least amount of money on you. Maybe just change about $40 US at the airport for the taxi. Also, very important, make sure you keep your luggage tag as they will ask for them when you exit the airport. From experience, they won't let you out until you show it to then! If you make a trip to the bank, just know that for security, you are not allowed to talk on a cell phone inside the bank.