That is one part of the state I haven't visited. One thing I've noticed when I travel in the northern end of the state is that if you stay off the major highways, almost every road is fine (well, compared to metro-Milwaukee) and drivers are fantastic.

As you probably know, you're spitting distance to Duluth--you might want to try contacting the Duluth-Superior tourism board. A lot of the metro areas in northern WI/MN, encourage bicycle tourism. If they don't have maps of bike routes you can use to plot a longer route, they should be able to give you a good idea of which major roads to avoid.