I spent a beautiful 3 nights camped near Dewey Point, about 10 miles west of Glacier Point, a hefty but do-able one day hike, or a leisurely 2-day journey. Camping at Dewey was nearly ideal, we had a premier campsite overlooking the valley, directly accros from the west face of El Capitan. If you hike barely a quarter mile past Dewey Point itself, there's a wooded area right off the trail on the edge of the valley with lots of nice places to set up camp. The only caveat is that there's no water at the campsite itself, so you have to stock up before you get to Dewey. Walking west from Glacier Point, you have lots of beautiful opportunities to look over the valley, including Taft Point. You'll also cross Bridalveil creek, which was flowing strong when I was there, and was great for a swim. Continuing past Dewey point, you can get to Inspiration Point and Old Inspiration Point, and down to the valley floor if you desire. I didn't make it that far, but I know it's possible. Have a good trip!