We just returned from Isla and found the beer choices much better than expected, and certainly better than what is offered in the BVI. Being from Wisconsin and used to good beer, we hoped that we would have choices other than Dos Equis, Sol, Corona (yuk) and the watered down American beers.
Bohemia was excellent (full bodied) but the problem was it was very difficult to find. The only place we located it was at Caso's. We could not find a vendor that stocked it and most never heard of it. We started off drinking Dos but quickly discovered and enjoyed Pacifico which was available at a few vendors/mini markets.
The main grocery store has a poor selection of beer.