Bulldog, we were there 2yrs ago and, if I recall correctly, the airport is a large open-air area covered by a huge thatched roof. There is an observation deck on the 2nd floor, and also on the main level there is all the duty free stuff and vendors. There is an air-conditioned bar, but it looked pretty small, and I believe there was a VIP area as well. Last year on our way to Puerto Plata we stopped over in the Punta Cana airport and we were escorted to another roofed-in area that was enclosed and air conditioned too.
Hope this helps. If things have changed, maybe someone can shed some light on this. :)