Happiness for me comes more when I don't seek it directly.
Riding a bike when I am really focused and not thinking beyond the moment, playing sport, reading a book, making something, fixing things, taking photographs, talking to people etc.
These times I am most happy as I am not thinking if I am enjoying myself or annoyed or bored or if I am happy or whatever, I am just doing what I am doing and I probably wouldn't be even aware I was happy unless you asked me.
My recipe for happiness is do things that are absorbing and don't keep asking myself "am I happy yet?".
Being happy all the time is not something I'd want. Aiming for that would mean I'd miss out on other things that give life depth and value. Doesn't mean I actually want to be sad or miserable but a life that was purely happy would in my mind be rather shallow. So long as I get a good mix I would be happy
Serenity? Nah, not into serenity. Yeah might be nice for short periods of time now and then but I wouldn't want to be living a mostly serene life. If I was I wouldn't be happy!