The Abaco Islands are a sailing and boating universe. The major islands of this small archipelago are Great and Little Abaco, with the off-lying cays of Elbow Cay, Man-O-War Cay, Green Turtle Cay, Guana Cay, Stranger’s Cay, Umbrella Cay and Walker’s Cay completing the string. Somewhere in this 120-mile necklace of islands and often uninhabited cays and beaches, you’re sure to find…