The Steamship Authority is the largest ferry service to the Islands of Martha’s Vineyard and Nantucket from Cape Cod.  The winner of this item will receive a voucher valid for 2 round-trip passengers on the High-Speed Ferry between Hyannis and Nantucket. You must call the group sales office to make reservations in advance. Non-transferable or exchangeable and cannot be used to book separate one-way trips. Expires 12/31/18.