This is about the easiest to follow loop in the park - as with all trails here, look for faint blue blazes and blue signage. From the bicycle trailhead lot, follow the paved road back out to Juhan Rd. SW. Cross Juhan Rd to enter the equestrian lot and descend to the trailhead. Turn right and follow the singletrack into the woods. Descend a series of switchbacks and continue straight through the first intersection with equestrian trail.
Eventually you'll come to a split in the bike trail. Keep right here and follow the trail as it contours its way uphill. The trail is mostly smooth but there are occasional roots and rocks. After about 3/4 of a mile, you'll run into another bike trail junction. If you want to, you can link to the northern Creekside loops by turning right here.
To complete the loop, turn left to follow a semi-entertaining descent back to the first junction. Climb the switchbacks back out to the road.