To be a bit more specific to your questions:
Highway 2- Highway 2 is a good paved US-Highway. It is two lane for much of its route
- We travelled Hwy 2 just last month and it was in good condition. Not many bumps, no harmonic bouncing
September TravelThis will be a great time to travel. Fall color will be getting along (especially if you travel a bit later in the month. Western U.P. especially has a lot of maples, with lots of color.
AttractionsEastern/Central U.P.
- Mackinack Island. Touristy, but great!
- Soo Locks Another not to miss
- Tahquamenon Falls State Park (but not on Hwy 2)
- Seney National Wildlife Refuge. (but not on Hwy 2)
- Pictured Rocks National Lakeshore (take the boat tour in the afternoon for best color) (not on Hwy 2)
- Kitchi-Ti-Kipi (Big Spring) (just off Hwy 2)
Central/Western U.P.
- Lake Gogebic State Park
- Porcupine Mountains State Park & Lake of the Clouds
- Keweenaw Peninsula/Copper Harbor/Houghton Area
General
- Hiawatha and Ottawa National Forest cover much of the UP. Lots of campgrounds, hiking trails, etc.
- Several scenic byways/drives, including Whitefish Bay Scenic Byway in the east, Copper Country Scenic Byway on the Keweenaw, and Black River Scenic Byway in the west
- Many state parks with camping, hiking and attractions
- Great views and some neat campgroundsright on the shores of both Lake Michigan (Lake Michigan CG outside of St. Ignace in the east) and Lake Superior (Bay Furnace outside of Munising in CentralUP)
Even if you just travel through on Hwy 2, there are some neat things to see. But lots more off the highway. It just depends on how much time you have to linger in the U.P. vs getting to your destinations out west. Have fun!