Levis Mounds has well over 20 miles of singletrack to hike, and there's about another 20 miles of cross country ski trails that are also open to hiking. Some of the trails head up to the top of the mounds and provide gorgeous views of the surrounding Clark County forest from the tops of the sandstone cliffs.
From Black River Falls, go north on hwy 12/27 for 10 miles to Merrillan. Take a right on hwy 95. Go about 7 or 8 miles to fisher rd, turn left or north. (Where couny hwy J goes south to Hatfield, Fisher rd goes north) Go north on Fisher rd for about one mile. Trail center is first dirt/gravel rd on left. Look for brown sign.
http://www.tripleblaze.com/trail.php?c=3&i=500