It's amusing how MSP (the airport) is like a mini-Mall of America.

Mall of America is really hard to complete everything in one day. Prices are not crazy, but if you're expecting to find deals, you're going to be sorely disappointed. Better deals can be had in the Skyway in Downtown MPLS, which is a bit quirky and extensive. However, you can get a full weekend of entertainment there in Bloomington. You can go to the indoor water park at the Radisson right by the Mall, do all of the Mall activities and take the light rail up to Downtown to do whatever you want there.

Minneapolis is a city built with the knowledge that it is going to be cold from October-April. You can basically get by living there without ever stepping outside during the winter. Then when it warms up you can explore everything else and go to Twins games.