I'd first ask you to define happiness.
Temporary pleasures will always be fleeting, unreliable, and fraught with danger. Drugs and alcohol feel great in the moment, for example. So does eating junk food and watching TV. But we all know the problems with these things.
Is happiness the pleasure brought by fulfilling hobbies? That's probably a little more productive, but also will never be continuous. And often, if you try to make that your entire life, it loses its joy. The recreation is often the joyful part.
Personally for me, my interactions with patients and being able to use my intellect to help people medically is so deeply satisfying that I'm motivated to go to work despite there being so many things to hate about my job. So that's an interesting wrinkle on the idea of happiness.
I'm not really trying to get at an answer here. We just had a whole meditation retreat at my church about this exact topic: What is the purpose of life? But maybe some ideas to help you clarify your own thoughts about the subject.