Went to Kansas a few years ago, it just happened that a trip there for work coincided with the race that weekend. It was my first, and to this day, only race. I recommend, if you can get them, prerace infield passes. We were able to go all over, even into the winners circle. Some people were writing their names on the start/finish line. Got to see the cars going through pre-race inspection.
Sat about 1/3 of the way up, a little past the start/finish line, it was just high enough that you could see the whole track.
Favorite driver, Matt Kenseth, I believe he's in the #42 now.