From Route 6, turn at the brown Fort Hill sign onto Governor Prence Road and follow it to 70 Fort Hill Road, across from Captain Penniman House. Small parking areas serve the loop; an upper clearing gives a marsh view without walking the full circuit. The access has a 20-foot vehicle-length limit, so check that before bringing a long RV. You can also reach the trail from Hemenway Landing just north on Route 6; restrooms are listed there. No food service is listed at Fort Hill, so bring water and any snack you want.