A sketch book can go places and record many things that a camera can not. Sketching on site captures feelings that cannot be caught by a photo. You get a sense for the activity that you are witnessing. It connects your hand, your eyes and your mind. You become quicker and more observant. It also can serve as reference on illustrations. The mouse and the lion were under the bench in front of me. They also enjoyed the concert. You are never bored if you have your sketch book. Get into the habit.