The exit unto Hyw. 8, off of Hyw. 38 is not well identified. Keep an eye out for a little Stinson gas station across from the road. Look for the sign, Westport Rd.
There is a couple nice areas along the Westport Rd., at Wolf Lake to stop and take in the scene.
I would definitely consider taking Opinicon Rd through Chaffey’s Lock on the way back to Crosby for some excellent twisties. Yeah 10 / Perth Rd north of Opinicon is nice but Opinicon / Chaffey’s is just too good to pass by if you have the time. And be sure to stop at the Opinicon for lunch or an ice cream.