Designed to stimulate discussion of philosophy and art, the Interval is a favorite spot in the Marina for cocktails and conversation. It's inside the Long Now Foundation, with floor-to-ceiling bookshelves, which contain the canon of Western lit, rising above the prototype of a 10,000-year clock – a fitting backdrop for a daiquiri, gimlet or aged Tom Collins, or single-origin coffee, tea and snacks.
Note that the space is often reserved for private events; be sure to check the website before you head over.