Hike starts along Sentinel Creek and leads to Glacier Point at 7,214 feet. Stunning vistas of Yosemite Valley below as you climb. Union Point is 3.0 miles in; Glacier point is at 4.8 miles.
Look for the Four Mile trailhead off the right side of Southside Drive in Yosemite Valley before you reach Yosemite Lodge.
http://www.tripleblaze.com/trail.php?c=3&i=8533