Keystone Mountain Park Address: 66 Keystone Mtn Park Rd, Muncy Valley, PA 17758 Phone: (570) 482-2909 Parks Other Businesses: Rock Run Church at 39 Route 220, Muncy Valley, PA 17758 Beaver Lake Lodge at 1018 Myers Rd, Muncy Valley, PA 17758 Sullivan County Roadhouse at 4720 Route 220, Muncy Valley, PA 17758 Country Friends Cafe at 1211 Route 220, Muncy Valley, PA 17758