In reply to Murcantile:
> Fly into San fran then Train/Bus to Yosemite for a look around then Bus down to Bishop
Not sure I understand the 'bus down to Bishop' bit.
October is usually perfect for Yosemite. The Tioga pass can get shut down due to snow but usually opens again. Tuolumne can be perfect but cold (or of course too cold) but campsites are closed.