My recommendation would be August over July--you should encounter far fewer biting insects the later in summer you go which will make your time outdoors more enjoyable.
I like S_T's plan. You'll hit lots of highlights. I'd throw in Seney National Wildlife Refuge as well. I agree that if you can swing the time and expense, a trip up to Isle Royale NP is worth it.
If you want to experience some of the solitude of wilderness, but don't backcountry camp check out the yurt at Craig Lake State Park. It is the only structure on a small lake, comes with a lot of what you need to stay, and is only about a 1/4 mile walk from your car. You are very, very far from civilization, but can get there easily. It is a nice park to bike and hike in so you can leave your car parked for a couple days and explore. This is one of the places in the U.P. where you're most likely to see a moose.
Mentioning bikes--if you enjoying biking at all you might consider bringing yours, especially if they are either mountain bikes or fatter tire street bikes. Skinny tire bikes are of limited use so I'd leave them home.
Dining--just south of Munising is Camel Riders Resort which has surprisingly good food in the middle of the Hiawatha National Forest. Not a typical dining experience at all. Typical (but tasty) dining experience would be taking some Lehto's pasties to go and eat them overlooking Lake Michigan.
Lodging--I'm partial to the other side of the bay from the Keweenaw Peninsula because of family ties so if you have time after a trip up the Peninsula swing around to the other side and check out Aurora Borealis cabins in Skanee. Very different experience of Lake Superior--sandy, calm, shallow. Our stay was during the Perseid meteor shower. It was amazing laying out on their dock watching the meteors streak across a truly dark sky. We also heard both wolves and coyotes.
Speaking of dark skies--if you happen to be near the start/end of your trip during a new moon, check out the activities at the International Dark Sky Park in the Headlands near Mackinaw City. And for your whole trip (but especially while you're along the shores of Lake Superior) keep an eye on northern lights predictions. If you're lucky enough to be there when they are predicted and the skies are clear it is well worth it to get up in the night to try to see them.
Like S_T--wish I were in your shoes. A couple weeks in the U.P. sounds heavenly!