Adobe Bookshop brings me much happiness. Not only are there a zillion wonderful used books of all kinds, there is the man behind the books, Andrew McKinley. He is the heart and soul, and his wise, welcoming and super fun personality draws all sorts of colorful characters to gather and be eccentric.
You have a lot of hills to choose from in San Francisco but in my opinion the best (and most varied) views are from Bernal Hill. Bonus: from my kitchen table I can watch tiny blobs moving around on this hill-- slow blobs are people, fast blobs are dogs.