Tunnel Hill State Trail is a cycling trail in the bed of an old railway line and was created in the late 20th century using crushed limestone for its surface. Regular bikes will have a hard time getting purchase on this surface, and mountain bikes or hybrids are recommended. The trail is very level and goes for some time through an unlit tunnel, so visitors should bring their own method of illumination.

The forty-five mile trail takes riders from Harrisburg to Karnak and is very scenic, offering colorful wildflowers, Illinois prairie, oak forests, and a variety of wildlife, including red foxes, cottontail rabbits, raccoons, deer, and opossums. A bounty of songbirds makes for pleasant listening as you cycle. The trail has no services, so visitors are advised to bring in their own food and water.

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