You'll probably have better luck posting to this forum:
http://www.disboards.com/forumdisplay.php?f=131
I used to live in San Francisco...and it was about a 4 hour drive into Yosemite from there....so I dont think, though I was younger, a daytrip from L.A. would be wise.
We woudl stay in cabins just at the base of Half Dome...was awesome.
I'm visiting SoCal!
*scurries off to sleep, and hopes CPM gets all the info he/she needs*
I've been posting daily TR's. Hopefully you've been reading them.