Going from east to west gives you 2 choices; US-2, the lower route, and M-28, the northern route. They are both good choices.
Along US-2 you will find some nice beaches along northern Lake Michigan. There are national forest campgrounds much of the way. Be sure to stop at the National Forest office east of St. Ignace to pick up a NF map. The map will take you to some nice campgrounds that offer some lake kayaking. Just west of Manistique is Indian Lake State Park. We enjoyed the southern campground near the lake. Much further west near the town of Watersmeet (at US-2 & US-45) is a great area for kayaking. It's a chain of lakes that only allows non-motorized craft. You will also find many loons in this area. It's just west of Watersmeet and is called the Sylvania Tract and is part of the Ottawa National Forest. Link below.
http://www.fs.usda.gov/wps/portal/fsinternet/!ut/p/c4/04_SB8K8xLLM9MSSzPy8xBz9CP0os3gDfxMDT8MwRydLA1...If you really want to experience some great hiking you must visit the Porcupine Mountains Wilderness State Park. It's a huge park (59K acres) with many hiking trails. There are 2 campgrounds, the northern CG has electricity & showers. The southern campground is along the Presque Isle River and is rustic. The rustic campground is closer to some trails though. The small town of Ontonagon also has a small campground on it's northern end with electric and water and is located right on the beach. We really enjoyed the hiking trail that runs on both sides of the Presque Isle River at the southern end of the park and has many scenic overlooks of waterfalls and rocks in the river that you can walk out onto. Take your camera! Link below.
http://www.michigandnr.com/parksandtrails/details.aspx?type=SPRK&id=426The Keweenaw Peninsula (the part of the U.P. that sticks way up into Lake Superior) is interesting. There are several old mines you can visit. Fort Wilkins State Park up in Copper Harbor is worth a visit as the old fort has been maintained in great condition. If you go there be sure to take the drive along M-26 which skirts Lake Superior west and south of Copper Harbor. Go to Eagle Harbor and then a bit further south and stop at the Jampot (aka Poor Rock Abby) for some excellent baked goods and jam/jellies. It is run by monks. See link below.
http://store.societystjohn.com/Other potential stops would include the Woodland Park campground in Grand Marais on Lake Superior (at the end of M-77 north of Seney). Munising and Pictured Rocks National Lakeshore (nice municipal campground just west of Munising on Lake Superior). If you're brave you can kayak on the big lake and go out to Grand Island.
I could go on, but others have also offered some nice places to check out. Have a nice trip.
2018 Chevy 2500HD Duramax - 2015 Cedar Creek Silverback 29RE
16K Huskey EZ Roller Hitch - EU2000i Honda Generator