Hi David, one suggestion would be CastleClub.
Give Doug a call, the owner, and ask him if he can help you out even though you are 2 persons. ( usually they make arrangements for 6 persons ).
Check on
www.castleclubonline.com
The surrounding, view...magnificent!
If you explain why you do this, I am sure Doug can assist you.
Or why not spend a day on a catamaran, incl. lunch, drinks, snorkeling..
www.caribbeanoceanadventures.com
For restaurants close to where you are, you can either ask for something special at your hotel..like a dinner on the beach for the 2 of you, or for instance take a taxi to Papillon in Cofresi. About 20 min. drive.
Sunset cruise with snacks, wine? Possible to arrange by the boatcharters from Sosua beach.