I am in Sault Ontario, we have endless trails just north of us, great lakes four wheel drive association comes up here often enough.
You can head north of the sault and take mile 38 road east off highway 17. tons of trails up there,
also if you drive to searchmont and head down witman damn road there are tons of trails, all within 1 hour of you. Then of coarse you are only 90 mins from turtle ridge offroad park on Drummond Island.
If you want strictly U.P. information try www.glfwda.org
and post on the forums there.