The screening process can be so intimidating....I hate the question "have you ever exchanged sex for money or drugs?"....to which I reply "heck yes! I am married for crying out loud and if I don't give her my paycheck..........." <VBG>
The chances of contracting Malaria is exceptionally remote and no they do not recommend vaccinations for those that travel there on cruise ships. I agree that if you are going there on some kind of expedition to unearth ancient Mayan Ruins of search for a cure of cancer etc then yeah, probably then. If it make you feel better than go ahead with it and nobody will or should say anything against you for it but I personally do not think it is necessary or worth it.