Excellent. Thank you Bob!
I added a link to the Yosemite Valley Logistics page which has complete camping info. Personally, I never stay in Camp 4.
There's another walk-in site in the Valley. Camp 9, aka the Backpacker's campground, is a ten minute stroll from the Ahwahnee parking lot or a five minute walk from a drop-off location in Lower Pines. Technically, you're supposed to have a wilderness permit for the next day in order to stay there.
Well, why don't you tell us where you like to stay?
Can I come??
Sure. Bring two bottles of Cloud 9 Seity Zinfandel.
There is more info on Sunnyside Bench along with a handy picture depicting the route on the Yosemite Falls route page.
While most people climbing in Yosemite will be aware of Camp 4, where it is, etc., for completeness it seems it should be mentioned in the 'camping' section (also as it's the only walk-in site in the park!).