Town map of Town Forest and Brown's Woods (across street) available at https://littletonconservationtrust.org/property/town-forest/

Approximate NE end of Sprong Trail. https://littletonconservationtrust.org/property/newtown-hill/

There's an official blue-blazed trail that runs NNE to the midpoint of the property line that runs NW to SE. There's a branch connecting to the yellow trail, along the previously mentioned property line. The main blue trail continues NNE and becomes the Sprong Trail, ending at Tahattawan Rd. https://littletonconservationtrust.org/property/newtown-hill/

There is an additional piece of LCT property in this area. There is a yellow blazed loop, a blue-blazed connector to the yellow trail on Newtown Hill (runs alongside the short SW to NE property line), and a connector that runs south to Boxborough Road. https://littletonconservationtrust.org/property/newtown-hill/

This section of trail has blue blazes, and goes NE along the shore (further than shown on map) and connects with the yellow trail. Trail is pretty wet and infrequently used along the pond.

Conscience Hill is owned by MIT and hiking is allowed. But intervening parcel between MIT land and Timberlake Conservation property is private.
Private land extends SSE roughly parallel to Timberlake parcel from town line, through this point, to Keyes road.

All main trails have yellow blazes

The town claims parking here, but it's one vehicle and you need to park on the trail. There is a spur that connects to the trails at the corner of the Ronchetti Area.
https://www.shirley-ma.gov/sites/g/files/vyhlif5001/f/uploads/trails_map_2.pdf

Trail crossing is a bit sketchy during wet seasons. Cross narrower portion 5 yards upstream.

Signage states private property, but walking the trail is allowed as long as you stay on the trail and have pets leashed. Warns of video surveillance.