Weekend in Minnesota - Scenic areas a few hours outside Minneapolis

I will be in Minneapolis in 3 weeks and have take care of some business Wed to Fri morning. Therefore, I will have Friday afternoon, Saturday and Sun morning open before departure at 5PM on Sunday back in MSP.

Would love to do some hiking and/or site seeing. A quick glance show that the north shore of Lake Superior has some good parks* north of Duluth.

*Gooseberry Falls, Split Rock Lighthouse and Silver Lake came up as places to visit in that area.

I've never been to Minnesota so any help on getting the most bang for the buck over 2 nights would be appreciated. And open to anywhere that doesn't require driving all day.