Algonac to detroit should be quite easy. go to mapmyride.com and search for these areas. Dixie highway to jefferson avenue will get you all the way around lake Saint Clair. you can stay on Jefferson through downtown detroit, and it turns into Biddle avenue in Ecorse, then back to Jefferson in Trenton.
From there, it's back to dixie hwy in Monroe.
Please don't avoid Detroit, we need all the visitors we can get!