I'll second the vote for going up into Michigan and across the UP. I grew up there and it is a great place to visit. You can cross the Mackinaw bridge and take US 2 all the way to Minot. Picture Rocks up near Munising are beautiful and there are waterfalls all over that area. The Keweenaw penisula is a scenic area also, especially along Lake Superior. Going up this way above US 2 wouldn't add a whole lot to your trip. Some day I plan on taking US 2 all the way from St. Ignace, MI to Everett, WA. Have fun.