Mosquito Creek (the Racecourse) features 8 miles of hiking trails near Wilson, WY.
Drive south from Wilson on Fall Creek rd for 4.4 miles and take a right onto Mosquito Creek rd. Once the road crosses over Mosquito Creek, drive until there is a fork in the rd @3 miles. There is a parking area on the right. Trail starts behind you at the fork.
http://www.tripleblaze.com/trail.php?c=3&i=2747