I like seclusion, so I often camp in Tamarack, usually at the Andesite or Diorite campsites. It takes longer than you think to get there. You head north until you reach the dry wash with the "Tamarack Valley 9100 feet elevation" sign, then head left, uphill past the outhouse. Andesite has a nice view of Cornell Peak, which is so close you may want to climb it right away. Cornell has some serious exposure near the summit, btw, with nice views to the north and San Gorgonio.
Another good spot, but in Round Valley, would be Lotus, which is high up on the southern ridge. Just south of where you camp is an awesome view out to the south over the Tahquitz valley (a now-closed area where the Mountain Fire burned). You have to climb a bit to get to Lotus camp, so don't think you're finished hiking when you reach the (now dry) water spigot in Round Valley; save some energy for the final blast to camp.
Here's a shot of the map on the small ranger "hut" in Round Valley, circa October 2013. This is the place where people are supposed to mark their sites using a grease pencil.

Round Valley and Tamarack Valley Campsite Map