You can take the Cheecheemon ferry from Tobermory to Manitoulin Island(see
www.ontarioferries.com )
You might like the science centre at Sudbury.
Algonquin Park is scenic.
Avoid the zone from Parry Sound/Huntsville to Toronto on Friday and Sunday evenings (cottager and camper traffic)
Not what you asked about, but many like the ride around the north side of Superior.