Excellent trail system.
Take I-65 to exit number 178 which is SR 43 go south on SR 43 (away from the park---trust me this is correct) for a very short distance and then turn left onto Burnett Rd. Burnett Road will "T" into 9th St. Go right on 9th St. to Swisher Road which will be a hard left immediately after the Veterinary Office. Once on Swisher Road you will cross back under the Interstate and find the Park Gatehouse directly ahead.
http://www.tripleblaze.com/trail.php?c=3&i=4040