This sounds pretty close to what you are looking for:
http://www.casaescalante.com/rates.htm The combined units (both upstairs and downstairs) can be rented by the week. For US$2,750/week, you can have 4 bedrooms, 4 baths, a full bar, 2 queen size sofa beds, a 6-person jacuzzi, a 1300 square foot sun deck, 2 large verandas, over 400 feet of private beach, tropical orchard and gardens for up to 12 people.
When both units are rented together, the occupants can enjoy more privacy by having full access (instead of shared access) to the entire 412 feet of beach, 5 acres of land, and the rooftop sundeck.