A newly inaugurated network of trails in Liberty offers 5.5 miles of footpaths that traverse mature forest and gorges, and in places skirts the Sheepscot River. The Bolen Hill trail network features three different loops within more than 1,100 conserved acres, including part of Lake St. George State Park, which some of the trails cross, and land held by the Midcoast Conservancy. “There’s a lot of mature forest in there with a beautiful, open und…