The ultimate feel good show is Aria the complete series.
Might sound corny, but this show has helped me become a more optimistic person.
Nearly every episode utilizes the same formula, yet has a deep and meaningful message at the end.

One of my favorite bits has to be this one about enjoying life (Nearly all morals learned here are about enjoying life!).
I've heard it a million times, but hey, it's nice to remember something you take for granted.

If you want to excel in your goal, you have to enjoy it.
If the bad times roll in, you should treat them as the spices to enjoy life even more.

I've got a new outlook on life.
I've got a new smile tonight.
I think it's beautiful.