If you're traveling by train or bus, you're likely to pass through Old Milwaukee Road Depot. This terminal is a major transportation hub for the area and an attraction in itself.
You'll be spoiled for sightseeing choice when spending time in Downtown Minneapolis. Old Milwaukee Road Depot is a great place to begin here, but there are many other interesting attractions to check out. Target Field, Target Center, and University of Minnesota, Twin Cities are not far from the transportation hub and will fill in your day nicely.