How about a trip to San Francisco?

Hello my collar friends!

I'm going to Sacramento for a conference the second week of June, and I would like to take the opportunity that I'm crossing the Atlantic to do some sightseeing in the area the following week, starting June 14th. I'd like to go visit San Francisco, and a few other things, like Yosemite Park.

I know it's a little short notice for vacation time, but would there be anyone up to come play tourist with me between 14th and 22th of June?
And for those who know the area: what are the things I need to see while I'm there?

Note: I can't change the dates, because of the conference the week before. (Though I can arrange my touring schedule if we can arrange part-time)
I would really love to meet you all for real one day, so this is one opportunity. And I'm very easy-going, I'm sure we would have a lot of fun.