If you've always itched to touch the exhibits in a museum, the Exploratorium is the science museum for you. Family friendly, the exhibits are geared for all ages. (Find the two bowl-shaped seats located about half-way into the main space; sit in one, and get a friend to sit in the other. Just do it.) The Exploratorium is next to the Palace of Fine Arts and is within walking distance of Crissy Field. And if you're really up for a hike (and are bundled up) you can walk from here to the base of the Golden Gate Bridge and Fort Point.