I also thought about driving up so I could have my car but ended up taking the PS flights and didn't regret not having a car. Like has been said, the Twin Cities has good public transit and if you do have enough time away from studying to do something fun, there's a good chance you'll make friends with a local classmate and you can plan a trip together with his/her car. Or just rent a car for the day with your new Delta perks discount for cheaper than it would've cost you to drive up.