We used to use US-30 to go around Chicago but it's a zoo now as it goes thru a lot of business/shopping areas at 25-30 mph. Actually, we avoid Chicago entirely and go up to Michigan's U.P. on US-31 which is divided limited access all the way north from South Bend Indiana and is called I-96 to Benton Harbor, then becomes I-196 to Holland, and then US-31 from there to Mackinaw City at the Straits and it goes thru Traverse City. Across the huge very high 5 mile long Big Mac Bridge across the Straits to the U.P. and take US-2 west or when coming back east, Excellent scenic route and good roads and take no longer than going thru Chicago but a whole lot more pleasant and relaxing and so much to see and/or do. Sometimes we take US-131 to the Straits as it's also mostly limited access divided highway but it's inland and goes thru Grand Rapids which has over a million pop but is a very neat and clean prograssive city with many tall buildings and has so much to do and/or see. Further south the the Kalamazoo area which has around half a million pop and then US-131 continues south to I-80 at the Indiana border.
Thousands of CG's in Michigan and so many are along the lakeshore. Over 100 State Parks to go with the National Parks, State and National forests CG's, county and private CG's. Camping, boating, and RV'ing is huge in Michigan and US-31 goes right alnong the gold coast of tourism and popularity for visitors.
At the Straits, there's a short passenger ferry trip (no vehicles allowed on the Island) over to Mackinac Island. Very popular and the ferries go from both St Ignace on the north side and Mackinaw City on the south side. A whole different world!
The most popular Michigan State Parks are Grand Haven, Holland, and Ludington with Hoffmaster not far behind. Grand Haven SP annually gets a little over 2 million visitors each year and Holland SP close to 2 million. Why? Because there's so much to do for all ages in these areas and very family orienated and extremely clean, friendly, and inexpensive. Most visitors come back year after year so they must like it! We've lived here for over 73 years now and know.