If I have enough time (usually on the weekends, or if I have no homework after school one day) I'll watch one of my favourite movies. They always give me hope and make me feel better.
Music is a big one too. Oddly enough I find cleaning very relaxing. I'll sometimes blast some music and dance while cleaning my room. Usually makes me feel better. And, it's productive!
Baking is also very relaxing for me...I bake something just about every weekend.