Indiana Dunes is a nice introduction, not so far.<quoted text>
Depends on what you're looking for. I don't spend too much time in the ocean ... vacation is just a way to get away and relax somewhere in my eyes. If you like to swim in the ocean, then you are correct. If you don't really care then Michigan sounds like it might be an alternative depending on what other things they have going on. You don't know till you try.
We went there one year for a short vacay. Took a train into Chicago for a day. Very nice.