If you are able to walk definitely try and park south of the stadium near the Benton Street area (watch out for no parking areas). There used to be an old open lot at either a school or a church that you could pay to park in. Leave via Highway 1. It won't be quick but it'll definitely be quicker.
I grew up going to games at Kinnick and have been to more Cyhawk games there than I can remember. It's always a cool atmosphere and I've never had a big issue with fans other than the expected "**** state". Like others have said, go, have fun, don't be a prick yourself and you'll be fine. As much as I love some good smack talk, you're better off to just hold it in and not instigate.
Two demographics to avoid:
1. Frat Boys
2. anybody that looks remotely similar to this
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