Best cheap/free entertainment in San Fran?

We're spending 1 week in San Fran for our anniversary in March. All the money we were planning on using there is now going to our new home downpayment. (I know, great timing, right?)The trip's been planned for so long, and our hotel and transportation are free, so we definitely still want to go. I know... show more We're spending 1 week in San Fran for our anniversary in March. All the money we were planning on using there is now going to our new home downpayment. (I know, great timing, right?)The trip's been planned for so long, and our hotel and transportation are free, so we definitely still want to go.

I know we can easily spend a day or so running around China Town and the Height/Ashbury area.

What are some other cheap/free things we can do in/around San Fran?
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