RedCanny,
We've done a few centuries now in WI and I can say without a doubt, the Door County Century (this year I believe it's Sep 10th) is the most beautiful one we've done. The scenery and routes are great. They used to even ride thru one of the towns (Fish Creek) which was average and since have removed that part of the route and made it even better.

Start your trip out at a White Gull Inn Fish Boil on Friday night (the *best*). Spend the weekend, Door County is really pretty. The century is in Sevastopol, which is actually right at Sturgeon Bay which is the "door" to the Door County area. We often stay at the Chanticleer when we do it as it's a great B&B. We learned, don't leave on Sunday. After the century it's nice to go back to your b&b and enjoy a nice long bath. Sometimes a fire...it can be chillier in Sep at times.

You could also opt to stay in Fish Creek or Sister Bay, they're about 30 minutes from where the century starts.

Have fun!