Touristic Islands of Abacos, Bahamas Trip. Abacos Tourism and Marsh Harbour Environment. The Abacos Great and Little Abaco, and their offshore cays are one of the jewels of the Bahamas: a 320km crescent of sand that's a sailor's paradise, a history-buff's delight, a seafood-lover's dream and a bold entry in any diver's wish list. Most Abaconians live in Marsh Harbour, capital of Great Abaco and the only urban area of any size. This bustling 'metropolis'...