As diego mentioned, Silicon Valley is about doing, so see the do-ers and the do-ers hangouts:
* Visit google's campus in Mountain View (cab ride from Caltrain);
* Visit DogPatch Labs in SF (15 minute walk from Caltrain);
* Visit RocketSpace in SF (15 minute walk from Caltrain);
* Visit Hacker Dojo in Mountain View (10 minute walk from Caltrain);
* Walk around Stanford's campus (5 min walk from Caltrain);
* Grab coffee at Coupa Cafe or lunch at University Cafe
in Palo Alto (5 minute walk from Caltrain);
* Don't visit Facebook (it's a boring campus).
If you're an avid reader of Hacker News, seeing some of these places might provide some helpful context for the stories you read.Obviously, if you're going to visit these places or others, drop another story on HN with places + times and I'm sure folks will try to greet you.
Hacker Dojo allows guests from 8AM to 10PM
depending on member presence, and is open
24/7 to members.
I'm sure there'll be people there on the weekends.If you're an Apple fan, don't forget to swing by the Apple campus store at 1 Infinite Loop. They had plenty of trinkets in there I hadn't seen at other stores.
Palo Alto is a pretty nice town in its own right although it's not culture central like SF. Must admit I'm not a big SF fan though and prefer heading to where interesting things are occurring rather than wandering about as a tourist.
If you have a car, Buck's of Woodside is worth a visit if you appreciate its history and significance in geek culture, but if you don't, there's little to actively see.
Depends on what you want to see. Silicon Valley itself isn't actually all that exciting as a tourist imo; lots of interesting stuff goes on there, but mostly inside nondescript office parks. But the Computer History Museum is cool. San Francisco is a fairly interesting city, but much of its interestingness isn't specifically "silicon valley", though it does have considerable tech. There's also lots of nature-stuff nearby if you're into that.
A commute from sf to palo alto isn't horrendous if you live in the southern parts of the city. But try to find an opportunity in the city. Unless apartment complex living in th valley appeals to you...
My wife and I rented a car from San Jose and drove around. If you are used to public transport in Europe or even Australia - you'll find navigating your way around solely on public transport difficult.
But, California has a great highway system, so if you feel brave enough and have some cash - a rental car allows you to see more in the short amount of time you'll have.
That said, when I visited the Google campus in Mountain View, there wasn't a whole lot to see; plus I found myself feeling a little unwelcome with everyone doing a double check on whether we had badges on (which is a good thing... for campus security!). But that may have just been the SLR camera I was walking around with ;-) On the serious side - their campus is nice - and they have multi-coloured bicycles for getting around... cool!
I'd definitely try to checkout Stanford - the campus is gorgeous (as is Berkeley - if you can get there); Luckily, I happened to be there the day Steve Job's ceremony was being conducted - so we got to see the campus, the secret service, California police, and a whole bunch of celebs.
For the Icons of IT tour, if you have the time (and a car) you could check out all the other Silicon Valley icons within short driving distance:
* Apple in Cupertino
* Yahoo! in Sunnyvale
* Cisco in San Jose
* eBay's Whitman campus (they have a nice play house with an office built inside)
* Intel museum in Santa Clara
The Facebook office isn't very exciting - we arrived at their Palo Alto campus but there's nothing to see - you can wander into the foyer and take a peek through the glass doors where all the staff work, but that's about it.Also, the computer history museum is excellent - it'll take you a few hours to really get through the various sections so if you have the time - I'd check that out. That's right near Google, so you could walk (20mins?) from Google's office.
* be a fanboy and visit corporate campuses
* be a tourist and go run around somewhere
Not being a fanboy myself, I'd vote to spend the day in Santa Cruz. Stay for the sunset. Much more interesting than Google.
Good luck with your interview!
And like @jack said, buy some local artisan goods.
That's exactly what you need :)