I am currently an undergrad at Creighton, and I have fallen in love with the Omaha area. The city has about 800,000 people... Big enough that it has a city feel, but small enough that its easy to be familiar with most of the city. There are lots of great tourist activities- great zoo, botanical gardens, world's largest pedestrian bridge crossing to Iowa, unique restaurants, neat downtown area ("Old Market"), and lots of up and coming music. It's very mid-western, in the sense that things don't happen at a crazy pace and the people are helpful.
The first time I came to Nebraska was for an undergrad visit to Creighton, and I was pleasantly surprised. I think you will be too 🙂