I did that trip a few years back and have seen much of MI's UP since I was a kid (Miner's Castle had 2 towers when I was there and you could walk out on to it)
Shortly after you cross the bridge and turn west on to US2, stop at one of the turn outs along the Lake Michigan shoreline. AMAZING, beautiful beaches !
Not far off of US2 is Palms Book State Park. Home of the Big Spring or Kitch-iti-kipi. A very unique, deep, clear fresh water spring and pond. Worth going out of your way for !
If you drive north on M117 or M77 for a couple of miles and pull over and get out of the car, you will notice something interesting. Both of those roads run perfectly north-south for quite a few miles. They are cut straight through the forest. Stand in the middle of the road (likely there will be no traffic) and you can actually see the curvature of the earth !
Coming up to Escanaba, US2 cross a very impressive highway bridge at either Big Bay de Noc or Little Bay de Noc.
There is the the Copper Peak Ski Flying hill and the Pine Mountain Ski Jump both in Iron Mountain, MI.
Most of the UPs other attractions are along the Lake Superior coast or the far northwest portion of the UP.
Lots of trees. Lots and LOTS of trees ! I don't think there are any "old growth" stands but most of it has not been harvested in 80-100 years.