By any chance did you mean Manteno? I saw the topic title and took a look, if only to know which "Grant Park" you were talking about since neither are particularly close to Mokena.

There are/were a couple interesting Mexican places on Ill1/Dixie Hwy in Beecher (Habanero Grill, Burrito Jerez), but I haven't been to either in a while. Other than those, the only other place worth considering for lunch is (was? hope it's still open!) Dal Santo's in Crete. It's a few blocks west of Ill394 on Steger Rd...good deli sandwiches.