Hartwick Pines State Park
At 9,672 acres, “…Hartwick Pines is one of the largest state parks in the Lower Peninsula. The park’s rolling hills, which are built of ancient glacial deposit, overlook the valley of the East Branch of the AuSable River, four small lakes and unique timber lands. The principal feature of this park is the 49-acre forest of old growth pines which gives the park its name.” Here is Grayings website describing the park. The Park website. Phone 989-348-7068
Old Growth Trail is 1.25 mile loop which takes you into the park’s “49-acre tract of virgin timber, the largest continuous stand of old growth white pines in the Lower Peninsula.”
Au Sable River Trail is a 3.9-mile interpretive foot trail that passes through old growth trees along the banks of the Au Sable River.
? The Mertz Grade Trail is a 2-mile trail that begins at the picnic area. The trail then follows an abandoned railroad area and through a second-growth forest. The description does not say this is easy, but old railways usually are. Best to call ahead to be sure.