Pere Marquette State Park
At 8,000 acres, Pere Marquette State Park is the largest state park in Illinois. Go hiking on wooded trails, biking along scenic bluffs, fishing and boating on the Illinois River, or horseback riding through the forest. The park is also known for its guided fall color drives and eagle-watching tours in the winter. The rustic stone-and-timber Pere Marquette Lodge makes a great base for exploring the area.