Careful where you step at Argonaut: There's probably a $500 book or six in those stacks by your feet. One false move could mean a swift kick to a first-edition Mark Twain, Bret Harte, or Jack London. The bookstore specializes in rare books with a San Francisco or California connection. Not only does it offer the works of local literary masters, but you can also find pictorials depicting, say, the history of Telegraph Hill (bet you didn't know that before Coit Tower was built, the peak sported a sign reading "WELCOME"). There's also a stunning collection of paper ephemera, including 19th-century maps and World War I propaganda art.