GadgetGuy goes Fremont, CA

I just got my travel details – I’ll be arriving in SFO on April 15th, the return flight is planned for April 28th.
It’s a business trip (if you’re clever you’ll know what I’m working on ;) ), but I’ll have one full weekend plus a friday to get to know the area.
I’d like to see Stanford and SanFran, other that that I’m open for suggestions.

So, what do you recommend? What’s the best way of getting around – car or public transport? Any hints gladly appreciated!