Calling all San Franciscans

Fr3shStrt

I'll be in your lovely city for three days in May. Looking for any tips on where to go, what to do, where to stay, what to eat, etc?
I'll be traveling with my awesome mom, so things like night clubs are out. We are driving down from Seattle making a stop to hike, visit Sonoma, check out Big Sur and finally arrive in San Francisco on a Friday afternoon. We'll be giving up the car when we arrive so we are looking to stay in the city, walking and taking public transit to check out the sites.

Thanks in advance for your input!