We suggest waiting until you get to Costa Rica for the best exchange rate. You can do it upon arrival at the airport, which is usually the simplest option as you can exchange your cash before you even step foot outside. You can also make your exchange at some high-end hotels, but they may not have the most favorable rate. Money exchange is also provided at most banks and ATMs, although ATMs may be unreliable. Look into fees your bank may charge as they tend to be higher for international transactions. Please note: to exchange money in Costa Rica, you’ll need to bring your passport.