I've done a few of those roads in my riding days, notably the Rattlesnake Point Road and a few of the Rosseau Backroads, as well. Once I went to visit a friend's cottage in that area and actually thanked him not only for the invitation, but for the directions he gave me, which allowed me two hours of twists and turns like I've never done before or since. There's a good one just south of Parry Sound as well, but it's not on the map. One of my favourites from years ago, is to take Brant Road, straight north out of Burlington. Go north of Highway 5 and enjoy the fun, until you get to the end, which is the road to Carlisle. You can go east over to Guelph Line and catch a couple of nice spots, and then over to Rattlesnake Point Road. I used to drag the floorboards of my bike through those turns. One had to keep the power on to get through them, as a 180 degree turn on a steep uphill slope is not one to go timidly through. Looking forward to some twists and turns in my C4, but unfortunately in the Windsor area, it's just way too flat for that.
Road trip time!
I used to live in that area and have driven up Rattlesnake Point a few times in my little Sonic. I had to go flat-out in 1st gear to climb it, it was so steep!!!