A protected encounter (condom for vaginal sex) would be zero risk for HIV, chalmaydia, gonorrhea, NGU.
There is slight chance (condom protected vaginal sex) for herpes, HPV/warts, syphilis, and some other uclerating STDs.
I'm glad you are educating yourself on STDs. Continue to read through these forums, to know: how, and why, and who is getting infected with them.
A cautious advice is to say: Don't go to cuba with a sex drive mentality.
Go to cuba to relax, enjoy, live and positively enjoy yourself.
you need to talk to this potential partner about their std history and testing history.
grace