Colones (₡) are the official currency in Costa Rica.
Travelers from the US need not worry about getting their hand on colones before making the trip. The American dollar is accepted almost everywhere and fair trade rates are used when giving change.
Bills larger than $20 are not accepted because of the ease of counterfeit. Customs gives a bad exchange rate when leaving Costa Rica, so make sure all of the colones in your possession have been spent.
CREDIT CARDS & ATMS
ATMs can be found throughout Costa Rica, and credit cards are wildely accepted with the exception being in some rural areas or small towns.