HI Pello
I cycled through the plains and i can tell you that it isn't much fun. There is almost nothing except fields endless Roads. The towns are not very attractive and in general its just not the best place for cycling. An another big negative aspect is that the Wind really blows, not just a little but really hard. I would prefer the Deserts or the Mountains.
Pictures from my trip Las Vegas to Chicago:
www.lost-horizon.de/usa.html. The Log is unfortunately in German
Korbinian