Bordering both Connecticut and Rhode Island, this popular 5,907-acre state forest offers a variety of recreational opportunities. I didn't put the trail length because there are many trails from 1/2 mile to many miles. Trail maps are online.
The forest is located off of Rte 16 in Douglas Ma. Easy to get to from 495 anywere.
http://www.tripleblaze.com/trail.php?c=3&i=2098