Trail sections currently open include from Hawley and Route 176 in Mundelein west and north through Lakewood and Singing Hills to Marl Flat Forest Preserve in Volo; along the Round Lake Bike Path; from Hook Drive east through Rollins Savanna Forest Preserve in Grayslake; and from Bonner Heritage Farm to McDonald Woods Forest Preserve in Lindenhurst.
A 4 mile stretch of gravel trail called "Fort Hill Trail" connects Ray Lake Preserve to the Millennium Trail/Lakewood trail systems with the imminent opening of an underpass at Gilmer Road. The Fort Hill Trail parking area is located on the west side of Gilmer Road, north of Route 176. You can also park at Ray Lake Preserve on Erhart Road between Fremont Center and Gilmer Roads. A highlight of this trail is the side "Loop Trail" through the former Four Winds Golf Club on the old golf cart path. (Click to enlarge maps.)
Ft. Hill Trail through Ray Lake Preserve
These maps will have to be revised after two Route 176 underpasses are completed in 2012, allowing easier passage for both trails by avoiding road crossings.
Here's a brief video highlighting some of the sights of the two trails...