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          When flying into the out island of Abaco, the Great Abaco Highway appears like a white strip of ribbon threading its way through green forests. Here's a scene from my spy thriller- "Penumbra Database." If you want a real out island vacation adventure, go to Abaco, Bahamas!      Penumbra Database: Episode 1 snippet:      Everything was quiet along the Great Abaco Highway (GAH) south of Marsh Harbor, the capital of Abaco, a 120-mile long, boomerang-shaped out island in the Bahamas. The GAH stretches from Walker’s Cay on the northern tip, cuts through the central region where Marsh Harbor lies, then threads its way through heavy forest to the desolate southern end where it abruptly runs into the ocean at a remote village called Sandy Point.             Bolan Tougas maneuvered the Ford Expedition SUV in a feeble attempt to avoid a cornucopia of deep chuckholes lining the southern corridor of the GAH.             “Fuckin’ potholes!” The left fro