Actually, we made it to Minnesota, but only to get two caches at the visitor's center, which was a short but worthy stop. Anyway, I thought I'd show a map and a few caches some of you may want to add to your bucket list.
Covert Cache (Traditional)(Regular) (GC3798) by Director Phineas and Agents Socko and Illbegotten(3/1) (Milwaulkee, Wisconsin) - Firstly, I am not a big fan of urban caches, nor am I a big fan of caches at businesses. But this place is amazing and the spy theme fits right in with geocaching. If you're in the area, you are missing out if you pass this up. I think the difficulty might be more of a 4 or 4.5.
The Big Spring Thing (Virtual)(Virtual) (GCGBR5) by datum(1/1) (Manistique, Michigan's Upper Peninsula) - An amazing emerald spring 40 feet deep with a glass-bottomed raft you wheel out into the middle to view bubbling springs and hundreds of trout, some 36-40 inches or more. This is a like a fish hatchery, tatiatuk's Emerald Cache, and Dave & Gail's Bubbling Spring Cache rolled into one. There is an EarthCache here as well, in order to log it you need to test the PH of the water, so come prepared if you want to log that.
Eternal Flame Falls Earthcache (Earth)(Not chosen) (GC10VMY) by Szuchie and TWU(1/3) (North Boston, New York) - I think it was UMainah who originally told me about this site, and we were glad we went. How can you go wrong when you have a waterfall and fire at the same location? It would have been even better had there been more water over the falls, but that also makes it harder to access. We were able to get right to the flame - very neat spot.
Frankenmuth Veteran's Memorial (Virtual)(Virtual) (GCAC28) by ixist(1/1) (Frankenmuth, Michigan) - The cache is a very nice veteran's memorial but even more amazing is the entire town. Very clean with a Bavarian influence. If you like Christmas, there is a huge store there that looks like it's a theme park.
The Old Boneyard (Traditional)(Small) (GCG999) by ScouterMark(2/2) (Scottsville, New York) - If you are a lover of cemeteries, this one is a neat old one where the only public access is via a tunnel.
Lake Michigan has a lot of fossils, and there are a few caches at places where you can find them easily.
We found many nice caches over and above this list. We planned our caches using favorite points and were not displeased.