What do you desire? Is it material? Spiritual?
Eh, I didn't respond to this because I wanted to provide a specific response, I more thought it would be interesting to consider the types of happiness in a generalized way. I phrased it as an "I" statement but I meant it as a generalized response to your general question: "What is happiness?" I think one type of happiness is the feeling that occurs when someone obtains something they desire. There's clearly at least one other type of happiness that occurs when something is obtained/received that a person didn't know they wanted until they had it (for instance, presents). We could probably break down "Rules of Happiness" by category: happiness brought about by physical/material things (possessions), happiness brought about via social interactions (interpersonal), happiness brought about by achievement or reaching one's goals (which could relate to either of the two already named). For instance.