Chicago has around 10 million pop and it's always busy on the south side roads /interstates 24/7. All traffic and trucks going to or thru from the east, west, and south have to travel/use these roads because of huge Lake Michigan they must go around the southside of.
Indiana Dunes are very nice and worth a visit if you have never seen or been in real sandunes. Although the dunes are much smaller than those going north of them starting about 60 miles north where they will be 300' to 500' high of pure golden quartz sand. It sings when you walk thru/across it and why it's called "singing sand".
They will very interesting and a real treat to walk barefood in the type of sugar soft very clean golden sand that continues right out into and forms the bottom of very deep Lake Michigan (923' deep, 100 miles wide and 340 miles long of pure unsalted potable water). We live in the sandunes by Grand Haven, Michigan which is approx 100 miles north of Indiana dunes and wouldn't move away period as it's so wonderful. This never breaking down salt or sugar sized grains of pure sand only occurs in 2 areas on the planet Earth. The Great Lakes, mainly in Michigan and in Australia. The sand constantly filters the water to Caribbean blue color and never gets silty and murky like lakes or water at/on clay bearing soils or runoff from normal lands. We often can see our boat anchor on the bottom when it's 30/40/50+ feet down in Lake Michigan when it's smooth.
The real biggies (dunes) are at Sleeping Bear Dunes Lakeshore National Park west of Traverse City, Michigan (about 60 miles of them). Also many very large dunes for the public to play in at PJ Hoffmaster State Park between Grand Haven and Muskegon. 2-1/2 miles of dunes and pristene pure sand beach in the State Park alone with 300 campsites in the thick woods behind the dunes and a very cool visitor center etc. Roughly 1200 acres in size along the shoreline.