I'm not really talking about doing something for society. I'm finding it difficult to put into words what I'm thinking.
Pursuing pleasure as an end goal rarely leads to pleasure. A lot of addictions seem to stem from the pursuit of pleasure as an end. We treat people for doing something that makes them "happy" to the exception of all else (whether that be gambling, alcohol, drugs, etc.). I honestly think if there was a happiness pill we would consider treating people for taking it.
When I talk about doing something, I'm talking about what you do with what life throws at you. Everyone has different circumstances, but what is common is the ability to choose how we respond to those circumstances. Whether we make something (whatever that means to us) of what we are given or not.
Taking a happiness drug and checking out from the rest of life is deciding to do exactly nothing with what life has given us. And I honestly don't think most people would want that.
I'll end with a quote from Viktor Frankl's excellent book Man's Search For Meaning:
"By declaring that man is responsible and must actualize the potential meaning of his life, I wish to stress that the true meaning of life is to be discovered in the world rather than within man or his own psyche, as though it were a closed system. I have termed this constitutive characteristic "the self-transcendence of human existence." It denotes the fact that being human always points, and is directed, to something or someone, other than oneself--be it a meaning to fulfill or another human being to encounter. The more one forgets himself--by giving himself to a cause to serve or another person to love--the more human he is and the more he actualizes himself. What is called self-actualization is not an attainable aim at all, for the simple reason that the more one would strive for it, the more he would miss it. In other words, self-actualization is possible only as a side-effect of self-transcendence."
I am sure I have butchered my own thoughts, but hopefully this helps make some sense of what I'm trying to say.