Williams Trail starts at the trailhead parking lot past Sunlight Mountain Resort on Four Mile Road. Access is at the far southeast corner of the parking lot. The first 100 yards is fairly steep. An alternative access is to head down Old Four Mile Road and take the Williams Connector about 100 yards down on the right.
Once on the trail, you'll contour around the lower slopes of Williams Peak. The singletrack is generally uphill with a small number of downhill sections for relief. At the end, you'll intersect with Babbish Gulch. Williams is actually better riding than the lower section of Babbish Gulch and probably a better option for access to the trail system.