I've done this a couple times also, once midsummer and once after labor day.
The first time I went north first, around the north edge of Superior and back across the UP on (IIRC) US 2. The traffic on 2 sucked, it was the least fun part of the trip.
The Canadian side was awesome. No traffic, decent road, and (at least on my trips) no apparent LEO activity (until we got to Quebec, that's a different story).
Took the ferry up lake Huron to Manitoulin Island, one of my favorite parts of the trip.
The north side of Superior is gorgeous and it feels very remote up there. It was also quite cold, probably something to do with the proximity of the lake. Be prepared. A large part of that ride is also pretty far from MC shops. I lost a chain in the backwoods on a Sunday, and was fortunate enough to be able to limp into Sudbury and find a shop. Should have planned ahead better there.
The lakes are fun, but IMO the Canadian side is the can't-miss portion.