kmov.com gives these hints:
Start by changing your attitude.
That’s right — I’m talking to you, pessimists.
A Harvard University study found that optimists are not only happier but are 50% less likely to have heart disease, a heart attack or a stroke. It turns out that keeping a positive outlook actually offers protection against cardiovascular disease.
The science doesn’t fare as well for pessimists. They have lower levels of happiness compared with optimists and are three times as likely to develop health problems as they age, researchers say.
Learn from people who are already happy.
Denmark has earned the top spot on the European Commission’s “Eurobarameter” for well-being and happiness every year since 1973. And when the United Nations went on the hunt for the happiest nation in the world, it ranked Denmark No. 1.
So what makes Danes more satisfied with their lives? Sure, things like life expectancy, gross domestic product and a low-corruption rate help. But the overall level of happiness in Denmark has more to do with the generosity that’s common among citizens, their freedom to make life choices and a strong social support system, according to the U.N. World Happiness Report.
Do It And How 
I have just started a gratitude diary and I think it is already making me happier, I love this post!
Where is scotch on the chart? 🙂