Enjoy Omaha, it is actually one of my favorite places...not only is it the home of Warren Buffet (Oracle of Omaha) but the town has a lot going for it. Stop in at Val's Pizza (Valentino's)
http://www.valentinos.com/
The lunch buffet is always a treat!
The sky won't be too bad there if the weather cooperates. I'm not a big fan of Denver but that is just me, it is a nice place too but just a little to "crunchy" for me...I much prefer Omaha.
Safe Travels,