I have been there several times. My sister lives in Minneapolis so we usually hit the mall once each trip just to see whats in the stores. It's only about 15 min from her house so its kinda like just going to our local mall here (which I never really do anyways). If you are there you may as well. If you have kids, the rides are kinda cool for them to play on. There are also some cool restaurants to get food in.
We also stop off in the Dells on our way up. Usually grab lunch there. Now that place is a tourist trap lol.