I'm glad that someone is still interpreting the lyrics of the song, even if there is no citation.  It seems to me that these interpretations should go on the discussion page instead of the main page, but they should still be here.  For my part, I don't even think he's arrived in San Francisco and that he's "trying" to hitch a ride.  On his way there, he's having second thoughts and is thinking he should return.  San Francisco seems to me to be just a symbol of another place and there doesn't seem to be any comment on the flower-power movement.