The weather is definitely cooling off, but if you find a chance to make it out, this link could be worth a try for Minnesota Lakes. This is a great Lake Finder where you can search by county or lake name and generally find a .pdf version of a map with decent amount of detail including access points and general fish survey information.
http://www.dnr.state.mn.us/lakefind/index.html
At this time of year, the rivers with some live bait could be more productive than lakes, although it has been almost a month since I have been out fishing myself. I can't recommend anything up on the NE side of town near Arden Hills, but the Mississippi River could be a good destination. I usually hit the Coon Rapids Dam and you can catch a wide variety of species there during warmer weather, so late Fall might also be worth a go.
Good luck,
Kevin E.