http://www.surfmusic.de/country/costa+rica.html has many streaming radio stations from Costa Rica.
Just click on what you want to listen to....it varies and what each station plays varies.
Caution: Do NOT download the player they want you to download....what you have already on your computer will do the job. Report back which channels you're liking. Remember: The bulk of the "target" "we" seek out like that ooogga booga rap crud. Still, there are many who enjoy very Latin oriented tuneage.
http://streema.com/radios/country/Costa_Rica has a bunch, by state within Costa Rica and why limit yourself to costa rica......
http://www.live365.com/genres/latin has a bunch of Latin music. Knock yourself out.
Too, so does
http://www.shoutcast.com/ simply look to the left and click on the LATIN link and see what you can acquire. There are a lot out there......