Tewksbury
Tewksbury has a segment of the Bay Circuit Trail along the Merrimack River, along with an assortment of other green spaces and trails.
Below is a Google map of Tewksbury that you can explore.
Featured in Tewksbury

Tewksbury Hospital Area Parks
There are a whole group of wonderful open spaces in and around the Tewksbury State Hospital, including the Pinnacle Trail, the Pines Cemetery Trail and Side Loop, The State Hospital Trail, and Pines Cemetery Main Trail.

Rogers Park
A small park, but as promised, contains some amazing boulders, in the western part of Tewksbury.
More Resources in Tewksbury

Tewkbury Trails
Trail maps for Tewksbury from town web site.

Tewksbury Conservation Commission
Town of Tewksbury Conservation Commission

All Trails
A link to All Trails extensive trail guides (membership may be necessary)