Concierge.com's insider take:
Chappaquiddick, an island just off Edgartown, is the least-known part of the Vineyard…well, least-known except for The Bridgethe one on which Mary Jo Kopechne lost her life and Ted Kennedy nearly lost his political career. But this tiny island is also one of the most beautiful places on the Vineyard. Hidden among its pines and oaks is the 14-acre Mytoi Japanese garden. Its red fretwork bridge, designed by architect Hugh Jones, is framed in daffodils, azaleas, hinoki cypress, and holly (depending on the season). You also can hike, fish, kayak, bird-watch, and pick blueberries. To get there, hop aboard what locals call the one-minute ferry (it actually takes three minutes) from the Edgartown wharf (Dike Rd.; 508-627-7689; thetrustees.org). There's another 14 miles of hiking trails in the Cape Poge Wildlife Refuge on the eastern edge of Chappaquiddick, including a stretch along a seven-mile barrier beach. The refuge includes ponds, cedar groves, salt marshes, and the 1893 Cape Poge Lighthouse, and there are tours that cover natural history, fishing, lighthouses, and wildlife (aboard a kayak or canoe) as well as self-guided tours. Over-sand vehicle permits (available at the gatehouse for $180) allow four-wheel-drive vehicles access to 14 miles of dune roads.