Join the GO Gurnee Walking Club at Marl Flat Forest Preserve (32609 N Fish Lake Rd, Round Lake)! View map location here! Directions/Walk details: 2 ways to take. You’ll have the option of doing both for a nice 3-mile walk. (To Route 120 & back is 1.5 miles and then to the subdivision on the East side of Wilson Road & back is another 1.5 miles.) Fully paved. Some hills. Pets allowed. Outhou