I've flown into and out of MSP a few times: from the air, it seems there should be some pretty easy vantage points, at least as the wind usually seems to be going. One gets quite a view of some of the neighborhoods from above, also they seem to come and go pretty low over some big highway where there are a few stores and restaurants on a service road. I'm afraid I don't know the town well enough to do more than picture these spots, which won't help you, but I think it's a promising place if you'd like to do that.
It seems they like to descend pretty rapidly and bank and all (Flying still hasn't lost its novelty to me, ...I may not care much for travel, but I love to fly. I'm usually pasted to the window most of the way when I do.
) Fun ride. I think that may make for about as interesting of photographs as airliners might provide, though.
I also have spotted a bunch of small airstrips in the area: I presume this may be where more of the more aviation-enthusiast types of craft fly from. It's a really popular activity around that region, aviation is, and also, photographing planes. (There's some pretty good photography talent in these clubs that restore like vintage warplanes, actually, I had some occasion to cross paths with some of those guys, they'd probably be a great resource.
)