As long as people are thinking of plant tours, there are the two local craft
breweries.
Summit is larger and in St Paul. www.summitbrewing.com/

Surly is very small, you can stand in one spot and turn around to see the
entire brewing area. It is in Brooklyn Center, just north of Minneapolis on
Hwy 100. Unfortunately they only have tours about once a month. Looks like
you would have to save this one for another trip.
www.surlybrewing.com/tours.php

--
Bill Fuhrmann