Salesforce trasit center park just opened. Free to go to & you can see some city views. Kind of like the highland in NY but only smaller.
Grab some.food plenty of places to sit & eat
Aside from the touristy-but-still-fun stuff like the Golden Gate Bridge, Pier 39, Ghirardelli Square, Golden Gate Park & Lombard Street, you could visit a museum (the deYoung or California Academy of Sciences are my personal favourites), take a hike (Lands End, Twin Peaks or nearby Muir Woods), or… More
I echo Golden Gate Park! It’s my favorite place in the city. I actually host a walking treasure hunt tour of the park if you’re interested. https://abnb.me/W9HIG6w1BZ