Pecatonica Forest Trail is a 1.7 mile moderately trafficked out and back trail located near Rockford, Illinois that features beautiful wild flowers and is good for all skill levels. The trail is primarily used for hiking, walking, nature trips, and birding and is best used from April until September.
Pecatonica River Forrest Preserve is a county park with a fair number of campsites, plus group camping along the river. The river meanders quite a bit, during the spring it is prone to flooding the field where the group camping is.
I camped here probably over a dozen times as a youth in the BSA as well as with family. Besides the campground there are a few nice trails to take. One runs along an oxbow swamp, it has a nice observation deck to watch the wildlife from over the oxbow swamp / pond.
In the other direction of the oxbow swamp there is a trail which runs through a hilly sandprarie. This sandprarie is a fairly unique ecosystem which is home to a number of endangered species.
The trail map can be found here: