I have a lot of different hobbies. Programming, working on cars, playing music, etc, but all are united by one theme. Being able to enjoy the fruits of my labor, in any realm, is what makes me happy. Bringing something to a close, even a small something, and being able to say, "hey, I did that" makes me happy. So wrestling with a bunch of code for hours and then seeing it work, that feels damn good. Or putting my foot down on the accelerator after working on my car for a while will just put a smile on my face for the rest of the day. Or being able to play a song that I struggled with for hours, I'll be bobbing my head and humming once I'm done playing. If you're stuck in a rut, dream for a bit, as in, think about where you want to be and how you can get there. And then go out and do what you like doing, but make a list of what you want to accomplish. I think once you are able to cross off an item on that list, you might feel pretty good. I don't know, that's what makes me happy, it might work for you too.