You can tackle this trail from the valley floor or from Glacier Point down into the valley. If starting at the valley floor, start at the Four Mile Trailhead along Southside Drive. The hike begins at the base of Sentinel Rock and climbs to the top of Yosemite Valley's rim at Glacier Point.
If you prefer to walk down hill, you can take the bus to Glacier Point and hike down to the valley floor. Buy bus tickets at the DNC tour desk during the summer.
To extend this hike, you can follow the Panorama Trail back to the Valley.
This trail is closed in the winter.