Brown County Reforestation Camp Trails features 20 miles of hiking trails near Green Bay, WI.
From Green Bay take 41/141 North to Exit 176 Sunset Beach Road. At the bottom of the ramp take a left. Go about 2.42 miles and take a right onto Reforestation Road. Go about 1.51 miles down Reforestation Road until you see the NEW ZOO on the right, and parking on the left. You will need a different pass to ride these trails, this is not a state trail. If you go into the NEW Zoo visitor center you can get more information there. I believe it is $3 daily and $15 annual.
http://www.tripleblaze.com/trail.php?c=3&i=1758