My biggest source of happiness comes from playing the violin and listening to music. I tried getting into making electronic music, but I too hit the wall of not wanting to sit in front of a computer anymore after workday. That's why I like the violin's pure analog-ness: absolutely raw and crude, no abstraction, no interface, fret-less, zero-config, no knobs to be _fiddled_ with. You sound as good as you can control your muscle.
Cooking is both a necessity and an absolute joy.
I also read books for entertainment (and for learning English). I especially like reading good prose aloud, and feel the rhythm of the language. And I sometimes write short stories.
At times, I hike with my SO and friends.
I also jog, but only for the health benefit. It's a torture, but the lesser evil compared with my nascent obesity.