Da UP, eh?
The UP can be a great place to tour. I grew up in Iron Mtn, and went to school at MTU in Houghton. Consider the touring the Keweenaw peninsula. It's beautiful along Lake Superior and Portage Lake.
Yeah, May weather can be spotty up there, but summer is wonderful - days are not too hot, nights are cool. You get l-o-n-g daylight hours that far north, and there is enough civilization to get a good meal if you don't feel like campsite cooking again.
Bob