Chicago to St. Louis vegetarian options?

I will be driving to and from St. Louis this coming week. I am a part-time vegetarian, meaning I am mostly vegetarian but occasionally eat fish. Are there any places I shouldn't miss? I am willing to take either I-57 or I-55, and I am willing to go out of my way for something really good.

Worse comes to worst, I'll just eat ice cream.

Thank you.

Guess this is way too late. But what type of food do you want. St. Louis has many places that will serve you vegetarian and it is on the menu. They also have places that serve great sea food or if you want an adventure you can go to one of the "restaurants" on the Mississippi and get some great catfish and buffalo fish.