Middle Fork State Fish and Wildlife Area Loop is a 16.6 mile lightly trafficked loop trail located near Collison, Illinois that features a river and is good for all skill levels. The trail offers a number of activity options and is best used from March until October. Dogs are also able to use this trail but must be kept on leash.
dogs on leash
As far as the regular camping area goes, and the terrain, it's nothing spectacular. You share the trails with horses, but everyone is generally very friendly. The terrain change is pretty good for Illinois. Very close to Kickapoo State Park, which has canoeing and other activities. The great part about this park is that if you camp in the hike-in area, you will almost certainly be completely secluded (aside from a healthy, boisterous frog population), next to a pond. It's a nice, peaceful base camp, well away from other campers.