You also might try SE near Rockville, IN..... Great twisty gravel roads. Most covered bridges of any county in the nation. No real trail system but very picturesque. Winds all over by the Wabash River. This is Parke Co. IN on your map.
Also check out the West Michigan Thread. We often talk about this area and others similar to it. Spend lot's of $$$$ in MI. We need them