Great list, Phocas. You listed the three most important things there:
-Eating wholesome, healthy food
-Regular exercise
-Proper, unbroken sleep
I have found that regulating those three aspects increases my chances of being in better moods. After 2-3 days of that, I can already feel the health and mood benefits and I have the energy to get through each day.
One point you made that I'll highlight is staying away from newspapers and general negative press. That's an excellent idea, although it is very difficult when there's advertising everywhere. It's hard to escape from - almost impossible in the 21st century - but it's best to keep your exposure to those things to a minimum.