On the MN 3/S Spring cruise we go north/south on County 7 near Welch, MN. Very fun road!!
Another area that looks like a lot of fun is all the Alphabet roads in Wisconsin off of Highway 35, near the Pepin area.
Rural cruises are a lot of fun. I remember waaaaaay back in 1999 I took the DSMers on a cruise:
http://mn3s.org/dsm-rural-cruise1999.html
later,
Curt