How to be happy for ever ( Not a fairy tale! )

I will just underline some ideas in order to get a structure for my thoughts. If you are an intelligent, you can apply this concept even further. As the story said: the only limit is your imagination.

- Obstacles in maintaining a higher level of happiness are:
a) a genetically determined set point for happiness , our average level of happiness will gravitate towards this value
b) happiness is a long life trait, and this kind of traits are not easily to change. It is possible, but it is implying a lot of effort.
c) hedonic adaptation - we adapt to all the positive (and negative) things (we get used with the good life), even if we receive a boost, it is only temporary.

-How to achieve sustainable increases of our happiness
a) the happiness set point is fixed, stable over time and immune to influence and control. We do not know any way to change it as he reflects immutable intrapersonal, temperamental and affective personality traits. Not a good way to increase happiness
b) circumstantial factors will provide a temporary boost, that it is rapidly lost due to hedonic adaptation. Work well on short term, but not feasible on long term.
c) intentional activity - we are talking about behavioral, cognitive and volitional activity. Hedonic adaptation seems to be much weaker in case on intentional activity. The slowest hedonic adaptation is observed in the volitional activity.

Conclusion:
Positive activity based changes last much longer than circumstantial changes, and volitional activity seems to be the best way to enhance and maintain happiness almost permanently.