Yeah... Omaha is the biggest and closest. Next biggest I think is Lincoln, but that's a bit away... I think it's at least an hour's drive. You're pretty close to the Iowa border, but... aside from cheap gas... doesn't really seem to be too much that way, so....
Papio's is nice. Think it's in Bellevue and Omaha too. They have go-karts, mini golf, batting cages, laser tag, spaceball, water wars, a pretty decent arcade, and a jumpshot competition thingy.
Linkage