Good for you!
My wife works at a hospital, and I drop her off, pick her up, and bring lunches to her. I see a lot of the inside of a hospital (she works at a good one), and the volunteers there are the next thing to frigging angels. They do all kinds of great work, including running an auxiliary cafeteria. I couldn't think of a better use of your time, as long as you can maintain that positive attitude. Some people go to hospitals to die, but far, far more of them go there to get well.