The 185 acre Waskosim’s Rock Reservation on Martha’s Vineyard is full of great trails that wind over the hilly terrain piled up by the glaciers fifteen thousand years ago. Waskosim was not a person — it mean’s “new stone” in the Wampanoag language, and in the 1600s the rock marked the boundary between English and Native American land. Today it lies very near the town line between West Tisbury and Chilmark.