How to pay in Costa Rica?

The currency of Costa Rica is the Colón.

The actually exchange rate (June 2015) is around 530 per USD. It’s helpful, to carry always both currency’s (USD/Colón) with you. Hotel, trips, taxes and entre of the national park is in USD. Supermarkets, shops, gas-stations, restaurants, etc. in Colón.

We recommend, paying always in the currency, whichever is given at the bill. Because you will get a bad exchange rate and it’s common, when you bay for example in the supermarket with USD, your change is in Colón.

Important note: Please don´t change (much) money at the airport, you´ll get an awful exchange rate. 
The best way is: Getting the money from the ATM, you can get USD and Colón.
To pay with the credit card is very common. Nearly every banc changes Euro, but to a bad rate.