Ask HN: Recommendations for a San Francisco Bubble Tour

I spent the first great internet bubble in Austin, and I'm living in Seattle for whatever it is we are going through now. I'm planning on spending a few days in San Francisco to see some friends, but while I'm there I'd like to see what life is like for the techies down there. Naturally I'll be staying with someone from AirBNB, but do you have any advice on the relevant coffee shops, restaurants, night clubs, events, etc?