Facts:

Languages and DialectsLanguages and Dialects

With all these immigrants comes a vast variety of languages spoken. The primary and official language of Costa Rica is Spanish. That said you will hear some different dialects of Spanish, including Spanish from Nicaragua, Panama, Columbia, Spain, and Mexico. Spanish in Costa Rica is unique to the area. It has unique sayings and phrases. For example Pura Vida (Pure Life) and Tuanis (Cool or laidback). The spirit of Pura vida can be best experienced in the Guanacaste region, specifically Nicoya, or the Caribbean sea. Many black people, especially on the Caribbean coast, speak a traditional Jamaican dialect of English. About 10 percent of the population speak English as a second language so feel free to try out English with locals. They will more than likely be happy to test their communication skills. Other languages you might hear are German, Chinese, French, Italian or Portuguese.

https://costarica.org/facts/population/