Free things to do in San Francisco?

My husband and I are headed to San Francisco this weekend for a wedding and are spending the day in the city. Of course, we're also strapped for cash. We're looking for free things to do in the town that are fun for a couple. Maps and websites help. :) If anyone knows of good ideas and how to GET said... show more My husband and I are headed to San Francisco this weekend for a wedding and are spending the day in the city. Of course, we're also strapped for cash.

We're looking for free things to do in the town that are fun for a couple. Maps and websites help. :) If anyone knows of good ideas and how to GET said places, where to park, how to get in, that kind of thing, it would help immensely as we're not from the area.

Thanks!
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