As an actual Lincoln resident that just noticed the thread. Food wise, if you want something nice, hit up something in the Venue family of restaurants, although Hiro88 is where I’d go if for some reason you want seafood/sushi in Nebraska. Stuhr22 is a pretty good Liberian/Jamaican joint. PhatJacks is the best BBQ, but you’ve likely had better. Misty’s is the traditional steakhouse but I’ve never cared for it. There’s some more hidden ethnic gems if you want more advice that way. (Lincoln has a lot of refugee resettlement because of our Lutheran community and the work Lutheran Family Services does and it’s great for our food scene)
For places to stay, outside the suicide motel at 27th and O, and some of the airport adjacent stuff you’re going to have basic travel hotels. If you had to stay downtown, I’d go with the Graduate over Embassy Suites, but that’s mostly cause I’ve had a lot of good times in that building.
For non-football stuff to see, the Capitol building is a pretty cool tour if you are into buildings. You can go look at Buffalo/escaping convicts if you go out to Pioneers Park. Otherwise it’s standard college town stuff.
As a place to stay alternative, hitting up Mahoney or Platte River State park for a cabin would probably be worth a look too.