There's another way in to Grater Woods too (in addition to the Pond Parish access):
Grater Road is about half a mile east of Pond Parish Road off Baboosic Lake Road. The sign is nearly invisible, but there is a large bank of mailboxes at the foot of the road. If you look down the road, there should be a "No Through Traffic" sign. Drive down Grater Road until the pavement ends. There's a small parking area there.
Ride up Grater Road until you reach a private house. Grater Road continues to the left down the hill.
The Peabody Mill Environmental Center is located in the Joe English Reservation, and the Amherst Conservation Commission used to have a map of it, but I don't see it on their web site anymore.
