Twin Peaks, Golden Gate Park, Union square shopping. Architecture: Victorians downtown bridges, etc. Largest Chinatown outside China. Theatre (beach Blanket Babylon alone worth a trip). North beach for what’s left of little Italy.
Cross the bridge to Sausilito. Down to carmel and Monterrey.
You could do a week and have a greta time if you know what to do and where to go.
It depends what you enjoy, I guess. I’ve done and been to many of those things and I’m still not enamoured with the “California experience”. Monterrey is nice, granted, but if you’ve been many times everything starts to wear on you. Carmel is also okay. Again, it’s different for everyone.
That's "Monterey", with one 'r'.