Where: 835 Market St; the Westfield Sky Terrace.
How to get here: This one's the hardest to find. Don't go into the mall, but instead into the building to the left at 835 Market with an SF state flag over it. Walk in past the guard at the lobby (like you know what you're doing, so no one gets weirded out), and hop in one of the elevators to the 8th floor. Only one elevator goes to the 9th, so rather than waiting for that one, just hop off on the 8th (unless you lucked out) and hit the 'Up' button to call an elevator to the 9th floor.
Amenities: There are a bunch of benches and a few tables, and since it's soooo high up, it gets a ton of sun. You've got views of the hills and City Hall, and you can pick up the Westfield Wi-Fi on a good day.
Best nearby takeout lunch: You might want to check out our mall guide, and grab some pho from Loving Hut, because it's actually pretty great.
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Joe Starkey is Thrillist's San Francisco Editor and will be tanning on rooftop #5 later today. Find him on Google Earth.