Whole-ass forest in the middle of the city that somehow contains an art museum and a bison paddock and other flummoxing things. Linked is a blog of journal experts from my trip with all we saw and ate.
The less you read about it (or look at maps) the better. Just enter via Haight Street, turn your phone off and wander 'til you reach the ocean. If you go on a Sunday afternoon and you didn't already come across it, proceed to turn your phone back on and track back to the 6th Avenue Skate Park to check out the roller disco party 🛼🔊😎