South of Marienville, the 7,200 acre Cook Forest State Park has 27 miles of hiking trails. The terrain is of rolling hills and cool valley streams. Special scenic areas are the old growth forest, Fire Tower/Seneca Point and the Clarion River. Overnight camping within the park is only permitted in the campground or cabin areas. Trail maps and descriptions are available at the park office. Part of the 140-mile Baker Trail and the North Country National Scenic Trail pass through Cook Forest. The Baker Trail runs from Freeport, in southern Armstrong County, to the Allegheny National Forest. The North Country Trail is under development and will connect the Missouri River in North Dakota with the Adirondack Mountains in New York.
To reach the park from the east, take Exit 78 off of Interstate 80, then PA 36 north directly to the park in Cooksburg.
To reach the park from the west, take Exit 60 off of Interstate 80, then take PA Route 66 north to Leeper. From Leeper, follow PA Route 36 south, seven miles to the park.
Overall, Cook Forest State Park is the 28th most popular hiking trail of all 32 hikes in Pennsylvania.