I have no *single* favorite childhood memory but rather a collection of favorites, most involving my sister. Our family did a lot of travelling when we were young, mostly by car (my parents were king and queen of the road trip, I swear), and my sister and I would be in the haven my parents had set up for us in the back seat - blankets and pillows and tons of music cassettes, coloring books and crayons, regular books, games. Those were some of the best times of my life, never mind my childhood.