I have done a search and read about whether or not to go into Chicago and where to eat outside the airport. What I am interested in, is if there is anything to do at the airport? Is there a library or reading room? Is there a museum or interesting display to visit? Is there somewhere you can go outside for some fresh air and watch planes? I am not thrilled about hanging around the RCC for 4 hours. At least there are 3 of those and I can bounce around between them if there's nothing else going on airside.

Thanks in advance for any suggestions!