http://www.migracion.go.cr
este es el web de migracion de costa rica talves ahi podas encontrar respuesta a tu pregunta
y esta otra informacion sacada de http://www.travelinparadisecr.com/costaricatravelairlines.htm
Citizens holding valid passports from the following countries are allowed to stay in Costa Rica for 30 days without a visa, though once in the country, they can apply for an extension (Prórroga de Turismo) from the Immigration office (Migración), which allows them to stay a total of 90 days:
Antigua & Barbuda, Australia, Bahamas, Bahrain, Barbados, Belize, Bolivia, Bulgaria, Chile, Colombia, Czech Republic, Dominica, El Salvador, Grenada , Guatemala, Guyana, Honduras, Iceland, Ireland, Jamaica, Kenya, Kuwait, Mexico, New Zealand, Oman, Philippines, Qatar, Russia, San Cristobal/Nevis, San Marino, St. Lucia, St. Vincent, Saudi Arabia, Singapore, Slovakia, South Africa, Suriname, Taiwan, Turkey, United Arab Emirates, The Vatican, and Venezuela.
Citizens of all countries not listed above must obtain a visa from a Costa Rican embassy or consulate before arrival.
Ojala te sirva