S.M.
I have been there before. I enjoyed it but I didn't have kids to entertain. They have a website http://www.liedlodge.org/index.cfm that you can check out the different things to do. I don't know if it would be a whole day place but its not far from Lincoln, 45-50 minutes. You could always go for part of the day. There is a great CHildren's Museum in downtown Lincoln. I have been there with 12 year olds and we all really enjoyed it. They have areas geared towards older kids and then areas for younger kids. Out south at 56th and Old Cheney (I think) there is a miniature golf course. It has two courses. I think there is one on the north side of town but i have never been there. That's about all I can come up with. I lived in Lincoln in college so no kids at the time. Hope that gives you a couple of ideas.