Exploring Southern Illinois by bike is a relaxing way to take in the beauty of the Shawnee National Forest. There are several trails set aside for bikes.
The 45 mile trail can be broken into a minimum of eight segments. There are additional trailheads where day trips can be started and stopped. The Northernmost end of the trail is in Harrisburg, IL. The Southern trailhead is at Karnak, IL.
Physically fit bikers can travel the entire length in a day. Most day riders travel the segment between Tunnel Hill and Vienna, IL. While it is perhaps the most scenic section with the most bridges, limiting yourself to this popular segment would result in a diminished experience. Each segment has something unique to offer.
This company will even rent bikes for a reasonable price to ride the trails: Sandburn Junction. Ask about group rates and stop in for some ice cream or a cold drink!