I lived in the UP for several years. It is a GREAT place to visit.
Here are some ideas:
* Mackinac Island - just off the bridge as you cross from LP to UP. great place, no cars, just horse drawn buggies, great fudge, sit on world's longest porch at the majestic Grand Hotel.
Soo Locks - Eastern UP. See Saltwater ships come through the St. Lawrence Seaway through the Great Lakes.
*Tahquamenon Falls - in central UP. Beautiful Falls.
*Kitchi-Ti-Kippi - crystal clear natural spring. You wouldn't expect to see down 100 feet to bottom and see fish that far below you.
*Pictured Rocks National Lakeshore - take the boat ride on Lake Superior, its the only way to really see the pictured rocks, but also explore the park and lighthouses on foot.
*Porcupine Mountains State Park - in Western UP. see lake of the clouds.
*Bond, Falls, Agate falls - in Western UP.
*Keewinaw Peninsula & Copper Harbor - NW UP. Beautiful Area.
Visit this website for more ideas: thingstodointheUP.com