On cool, crisp winter days nothing seems more inviting than the Crissy Field Warming Hut Bookstore/Cafe. Especially after a stroll or run along Crissy Field. They sell typical national park/museum store merchandise, with an emphasis on environmentally minded products. It might be a good place to shop for gifts for outdoorsy friends. The cafe has nice dishes inspired by Alice Waters, as well as the usual coffee shop offerings.