i haven't read much on here about blue hole.. it was one of my favorite places to go during my last trip, though the jump down was awfully scary and sometimes painful. i think it is a must see location for anybody... it has a pool, a bar and of course the blue hole (natural mineral water)
Its in Brighton.. its somewhere you would have to get a charter taxi to go.. i believe regular route taxis dont go to brighton only bike taxis.. i was fortunate to have a family member with a car who also frequently visited brighton to see his mother..
anyways just sharing some thoughts.
whenever you are going you should definitely check it out.