A valid passport is mandatory to enter Costa Rica.
Depending on your country of origin you may enter Costa Rica without a visa. USA, Canada and most European countries have this privilege. For more information please visit: Visas
Starting on July 30, 2007, the Costa Rican authorities will demand that all travelers coming from the following countries (Angola, Benin, Burkina Faso, Cameroon, Democratic Republic of the Congo, Gabon, Gambia, Guinea, Liberia, Nigeria, Sierra Leone, Sudan, Bolivia, Venezuela, Brazil, Peru, Colombia and Ecuador as well as the Republic of Guyana) have a yellow fever vaccination certificate
Departure tax is US$29.00, can be paid in US Dollars, colones or with a credit cards.