If you want to be happy, be a friend. Identify your most important relationships, and think about how you can be a true friend to your partner, to your children, to your parents, to your colleagues, to your clients, etc. Another way to increase your happiness score is to make a conscious commitment to being the most loving person you can possibly be. Your intention to love and be loved is the absolute key to happiness. Love is the most fun you can have with anyone. In the final analysis, there is no difference between happiness and love.
Next: Do what you love for a living