I would go if I could
Me too.
Every time that I've been out there and had some time to spare, it was after 4 o'clock in the afternoon (CHM closes at 5pm). Is there a presentation of the evolution of personal computers? Does Amiga, other than the upcoming 30 year anniversary, have a presence in this museum? If not, maybe it will after.
There is a lot of other cool things in the area: WeirdStuff Warehouse (within about 2 miles!), The Long Now Foundation (Fort Mason), Exploritorium (SF), etc.