First off, plan to get there early. Thisspring the road to the track is under construction. The detour is onl dirt roads. Other years the wait to get in was at least a mile back-up. With the detour it could be worse. I would chek out thier web site &/or call.
As far as spectating, bring lots of sun screen and water. The track is in a canyon/valley, with hills on 3 sides. It may be MN, but it gets real hot and humid. You have to watch at the sand woops for at least on race. The Sand Monster is almost as fun as the racing. Last year we sat on the side of one of the first down hills. If it was horizontial, it would have been tough, with all the woops and ruts, but this was at least 25-30 degree drop with a U-turn at the bottom.
Hope the waethers good. Maybye I'll see you there.