I finally got out for my first ride of the season yesterday: a couple of laps totalling 16 miles around Stoney Creek Metropark (Rochester, MI). Hey -- it's the first time out since last November, and I'm coming off of a running-related hamstring injury that's had me sidelined since January. Here's the course as recorded by my Forerunner:
It's 6 miles around the lake on the park road, and the northern spur adds another 3+ miles. It's a great place for hammering down, with lots of bikes there in the evenings and on weekends. There's a path alongside the route for runners and recreational bikers, but the roadies stick to the main road. Rolling elevation changes, and the spur is like a biker's speedway.
The only drawback is that it's also famous for wind that tends to circle in both directions at once, so no matter if you ride clockwise or counter-clockwise, you're going into the wind all the way around.