Happiness is what I live for. This can be everypony's personal quest, there is no general guide for how to be happy, since everyone defines and feels it differently.
For me...happiness is being positive. It's not about smiling and showing it on the outside, for me it's about the true inner feelings. A person who seems cold on the outside, could be one of the most happy persons on earth. And the most happy person on the outside could be nearly dead inside. For me, it's about the attitude and not about something like possessions or even health. I think it's very important to be able to be happy alone. Independently. And this leads to fulfilling relationships as well. The same feels attract each other, it's not like a magnet. Being negative means to attract other negative elements. And how will you find your way out of it, if you don't do it yourself and put some effort in it, right?