Polk & Post Convenience Store

24-hour gym inside the Marriott Marquis, open to the public. Clean, modern, with showers and a steam room.

SF's most famous 24hr donut shop. Home of the giant donut challenge. Open since the 1960s.

24-hour hospital and ER. Listed for completeness as a late-night critical resource.

Mid-Peninsula's late-night café. Espresso, panini, and a covered front patio that works as a third place.