Hi emmanuec,
I've climbed around on your island's mountains with my tropical fruit buddies. My avatar pic was taken in PR! You don't necessarily need vendors...you have lots of non-grape wine options if you want to try them. I begin to drool when I think of the possibilities...pulasan wine, rambutan wine, longan wine, langsat wine...you really ought to look at some jaboticaba wine...search here, there are at least a couple of threads on that one.
Welcome to WMT!