Places to visit in San Francisco

Hi,

For the ones living in San Francisco, what would you suggest to discover the region?

When you have friends or family visiting you, where do you go with them? What are the must-see places in San Francisco, the tourist sites?

How to visit the region in an original way? Any unusual or unknown place to recommend?

What would you suggest for a couple or days or for a week of holidays in San Francisco?

Thank you in advance for participating ;)

Julie

My San Francisco post