Several of Linn Run’s hiking trails connect to many miles of trails in Forbes State Forest. Mountain bikes are not permitted on hiking trails in Linn Run State Park, but are permitted on designated trails in Forbes State Forest. Adams Falls Trail is a 1-mile loop that features a mountain waterfall tucked in among rhododendron and hemlock. This very rocky trail passes by large boulders. Iscrupe Trail is a 0.75-mile trail that follows the original Linn Run Road and was used by early visitors to the Adams Falls Picnic Area. Flat Rock Trail is a 0.5-mile trail that ends at a large, smooth rock in the stream Linn Run. Swimming is not permitted in this area. Please be cautious, the rocks are very slippery! Grove Run Trail is a 4-mile loop that starts with a gentle slope behind the Grove Run Picnic Area and becomes progressively steeper. Part of this trail follows Grove Run. Snowmobiles are permitted on the road in the cabin area only. Road access to Forbes State Forest snowmobile trails is near the cabin area.