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Chrysina sp.
Beautiful - I would love to photograph one of these. Would you add this to the Beetles of Costa Rica mission?
http://www.projectnoah.org/missions/1270...
A wrong ID is worst thing! The problem is that if you have a wrong species and people are searching on the web for this species, all get the wrong one and everybody is taken this wrong ID for granted etc. So, if you are not 100% about the species, than be happy with the genus, that's for beetles already something for being happy!
I don't think you can get down to species level from this picture. I would take as scientific name just "Chrysina sp.". There are at least 20 species in Costa Rica. of which at least 5 are golden. My link below was just for illustrating both, the golden and silver one on the same picture.
Scarabaeidae, Chrysina sp., formerly also called Plusiotis sp.. Common one would be Chrysina resplendens, but there are over 20 additional species of Chrysina found in Costa Rica. I think it is not possible to get down to species from this single picture.