Speedy:
We are right behind you. HST from Crescent Meadow on the 11th, also coming from the Bay Area. I researched this pretty thoroughly, and came up with the best plan for us. Public transportation (almost) all the way. Greyhound or Amtrak, San Jose to Fresno, then a ride from a friend to Lodgepole. Park Shuttle all around Lodgepole area. From the Portal, hitch to town, stay at the Hostel, then early next day (about 6 am), CREST to Mammoth or Lee Vining, YARTS to Yosemite and Amtrak (yes Amtrak, Bus and Train combo) from Yosemite back to San Jose.You can actually get from Lone Pine back to Bay Area in one day, but we are going to try to crash at Camp 4 on the way.
We could do the same circuit out of Berkeley (BART connection), but our base is Palo Alto. With one private car, I would drive to Visalia, get the Visalia/SEKI shuttle ( EARLY: last one leaves for the park around 10 AM) to Lodgepole and look at CREST/YARTS/Amtrak/Greyhound back to Visalia. With no car, doing it without an overnight in Visalia is out, because of the Visalia/SEKI shuttle schedule, but it can be done.