mike_p

Hi Newt
I think that most of us who have lived in the Bay Area for many years would suggest Spring or Autumn as the best time to visit. The summer months on the coast are subject to fog and wind, which can be chilly. Every July in San Francisco will find tourists dressed in shorts and short sleeves shivering on street corners. Mark Twain is reputed to have said that the coldest winter he ever spent was a summer in San Francisco. Having worked on construction in The City, I have a feeling for that statement.
One bonsai site you wouldn't want to miss is the Golden State Bonsai Federation bonsai garden in Oakland. World class! Kathy Shaner is the curator.
Depending on when you visit, there may be other bonsai events you could attend, such as exhibits and club meetings.
I'm sure that if you decide on a time and post it here, we can come up with an itinerary for you.

Mike

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Nature is perfect.
Man's attempts to improve nature,
Are imperfect.
MP@BBB Studio

There is no way to happiness. Happiness is the way
Gautama Buddha