Forest Park Nature Center off of Galena Road in Peoria Heights has a lot of great trails with challenging terrain. Trails are clean and well marked. I have hiked all of the trails- except for the Pimiteoui. This would be a good day hike for the scouts. Here's a map.
Here's a link to Boy Scout camps in Illinois. Click the "IL" link on the site. Some of these might be fun for a weekend camping trip. ....something different from Wokanda or Ingersoll.
Came across this old map of Camp Wokanda on the web. It's a bit hard to read, but you should be able to make out the details of where the cabins and landmarks are. (Ignore the names in red)