This is a lovely trail with little rivers and pretty scenery. There's hilly terrain and I went during the winter so parts of the trail were icy. I got lost trying to do the full loop. The trail can intersect with a nearby trail if you aren't paying attention. So I suggest using this app to stay on course.
Thomas H. on McClaughry Springs Woods Trail
Great loop trail with moderately difficult hike up a steep, winding trail. Great hill to train on!
Mill Creek adds a nice touch to this enjoyable trail. Horseback rider was on the trail too.
The "start" icon on this map is incorrect though the trail is apparently in the Elizabeth Conkey Forest. And the maps on this site need a Map Key explaining what all the symbols mean.
That being said I usually take the trail starting at the point under the "w 135th st" signage. This is the Cooper's Hawk picnic area, and I go south here to Rubio Woods. I usually do only about 1.5-2.5 miles, one parking lot to the other & back. Distance of course depends on how far you wish to go, and if you believe the mile markers set out by the Forest Preserve District of Cook County. This is just part of a continuous trail throughout the forest which stretches from 131st St on the north to 167th Street to the south. Elevations, flora, & fauna all vary as well, but are totally lovely & enjoyable. Trails are asphalted and have an occasion trash bin along the way so they are usually clean. Trails are also available for jogging, cycling, roller blades. Enjoy!