Last year I found the trail from behinds JC Penny's at the Mall in Green Oak that leads to the Island Lake State Park. Park at the mall near Brighton and go up the hill behind the mall, over the RR tracks, down the hill on the other side to a short single track of a few hundred yards and you are out onto the Island Lake Drive. Within a half mile you are in the State Park. Rode from the mall to the trail head parking and did a loop around the paved path through a section that I have nicknamed The Cathedral, the trail crosses the parking lot for the riverbend picnic area and you can hop back on the State Park Road for the trip back. RT trip was 8.86 miles and gives me a weekly total on my new bike of: 49.46 miles. Yay!
a map to the ride can be found here.