Pick an area with a good groomed trail system. I know in Colorado we have several places with groomed trails that are right next to some gnarly play areas. This way if she is burned out or intimidated by the terrain, you can play while she is still riding the trails.
I have lots of recommendations in Colorado but I think that goes against your rule of keeping it closer to MN.
I have lots of recommendations in Colorado but I think that goes against your rule of keeping it closer to MN.