Running the entire outer perimeter loop of Martha’s Vineyard (including Chappaquidick Island). No running on pavement, asphalt or docks—sand, rocks and dunes only. You will need to swim across the channels, cuts and pond openings, as well as swimming to Chappaquidick and across the gut to the outer sandbar. No bridges, no canoes.
The Alternate Route adds approximately 6mi to the route but deviates by running around Oak Bluffs Harbor and Little Beach. Check the GPX file for specifics.