Martha's Vineyard offers superb terrain for biking -- you can pick up a map that shows the island's many dedicated bike paths from the chamber of commerce. Several shops throughout the island rent bicycles, many of them close to the ferry terminals. Martha's Vineyard Strictly Bikes rents bike racks for your car.
DeBettencourt's (Circuit Ave. Exit, Oak Bluffs. 508/693-0011). Edgartown Bicycles (Upper Main St., Edgartown. 508/627-9008). Martha's Vineyard Strictly Bikes (24 Union St., Vineyard Haven. 508/693-0782).