san francisco is full of really great attractions, yet, most tourist i've meet have sought to do the usual Fisherman's Warf, MOMA, Golden Gate Park, Golden Gate Bridge etc. as an urbanist, i'm constantly on the lookout of interesting and cool things to do, sharing my favorite bits and pieces of the city that make it great (to me). just recently the planning department of SF mandated to open private spaces to public spaces. this means that once privately owned terraces, courtyards, and parks are now open to the public, although detailed in how one gains access. when i found out about these spaces i went on a tour to a few spots in downtown SF, first stop was One Kearny off of Market Street. on the 11th floor is a terrace where you can picnic if you bring your food and gain a gorgeous view of downtown (like the photo above).
it's quite the tour and worth the effort in finding these cool new spots. if one was to ever make a tour of the city, i say this should be part of your itinerary. here's an entire map dedicated to this tour by the SF Planning Department.