Temporarily de-lurking here. Definitely take the train. The Pace busses are notoriously bad. Also note that the train ride from Chicago to Joliet is an hour and a half, so you are looking at 3 hours of your day for getting there and back. I would make an early start. Are you sure you can get a tour of the place? Or do you just want to see it?
Good Luck!
Erin
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