Possum Hollow Nature Trail, 3/4 mile in length, provides access to Park Pond and the pine seed orchard. Trail guides, available at the headquarters, campground, and picnic area, guide the visitor to the 35 interpretive stations. The Big Tree Trail, one mile in length, features a sycamore 78 inches in diameter, one of the largest to be found in Illinois. Rocky Spring Trail, three miles in length, includes Rocky Spring, a forest improvement area, walnut production areas and varied land and vegetation types. Seventeen miles of fire lanes also provide access to remote areas of the forest.