If you don't mind driving your car uphill on a long dirt road then I'd recommend Starting from the Fuller Ridge Trailhead on the PCT, and spending the night at Little Round Valley. The Fuller Ridge Trail is probably one of the prettiest trails on the mountain, with views north and east and west. Little Round Valley has no water flowing (the last I'd heard), but there IS water about a half mile below the camp, where the outflow from "Bed Springs" crosses the trail. Note also that you have to get your permit to camp from the STATE park to camp in Little Round Valley, not from the NFS.
State Park Website:
http://www.parks.ca.gov/?page_id=636State Park Permit:
http://www.parks.ca.gov/pages/636/files/dpr409.pdfCaltopo Map of the hike I did last August:
http://caltopo.com/m/4H0BOnce you've set up camp in LRV, you've got lots of opportunities for hiking. Either up the main trail to San Jacinto Peak, or go cross-country and bag one or more of the nearby trail-less peaks.
Standard Disclaimer:
Make sure to have a map, compass, gps, 10 essentials, spot device, PLB, satellite phone, helicopter escort, extraction team, etc etc blah blah blah
