Ask HN: Relocating to SF

Hello HN,

I am relocating to SF next week. Super excited and to some degree nervous about the shift. I wanted to specifically ask the HN crowd this. What are some of the things I should not miss in SF? (I am not talking about the things one can search online food, art, locations etc.) From an HN perspective, are there any groups/meetups you would recommend. What must one do to understand the zeitgeist?

Appreciate your suggestions.

Thanks