Can't fly in Interstate Park also the Saint Croix River corridor is classified a No Fly Zone on the maps, but I have heard of people flying there, so not sure if monitored closely. My neighbor is a SCF policeman and knew of someone flying over the river. Also a couple of grass field airports around Taylors Falls and north of Saint Croix Falls, but haven't seen much airplane action there. Hospital downtown gets a fair about of hilocoptor traffic so need to watch out for that. Lots of maple trees and oak trees along the gandy dancer trail north of Highway 8 for a few miles.
Whatever you do, do it safe and don't rune it for those of us that live and fly here.