The best hotel (I don't consider caba?as to be true hotels, but if you don't mind going into one then follow one of the other advice) that is near the airport is the Hodelpa, forgot its full name, but its the old Marriott on the Duarte Highway. Heading towards Santiago, it will be on the right.
Its a real hotel and close to the airport, which means you don't need to worry about people seeing you coming out of a caba?a alone, unless you hardly know anyone in the area or you don't have girlfriend/wife or her family/friends don't live in the area.