Earlier quoted context omitted.
Unfortunately the dunes and lake are not visible from that stretch of I-94. Southern Indiana is another beautiful part of the state. It's mostly rolling hills with lush green forests and farms.
You don't have to drive it on I-94; in fact, for many years it was faster not to, because of insane bottom of the lake traffic. You can take the Dunes Highway instead (and then keep off 94 up the Michigan shore; there's good stuff up there).
I actually stopped to stretch my legs and bag another national park at the Indiana Dunes National Park last Friday on my way back to Michigan from Wisconsin. Maybe AI was in a sour mood due to my poor decision to drive through Chicago from 3 to 6pm on a Friday, but I wasn't that impressed - Holland, Muskegon, Hoffmaster, Silver Lake, or Ludington State Parks up the Michigan coastline are all superior.
It only looks fantastic though a Chicagoan or Hoosier perspective because the rest of the area is a rust belt.