With 3/4 of a mile of trails, encompassing hills and rocks as well as woodlands, wetlands with a boardwalk, and a lovely pond, this gem hidden on Marblehead Neck is worth a visit particularly in the spring and fall when birds are migrating along the Atlantic coast.
For more details on the Marblehead Neck Wildlife Sanctuary, see:
http://www.massaudubon.org/get-outdoors/wildlife-sanctuaries/marblehead-neck