looks like i got two full days and nights. day 1: cahokia mounds and check out fast eddie's. after t gets out of class, we head for the arch and get touristy. day 2: i dunno...check out the local libraries i guess until t gets out.
That is a must do, Michael. My Mom and I stopped there (at your suggestion) on our way back from Missouri this summer and it was well worth the drive out of our way.