As I have grown older, I try and pleasure in simpler things. Knowing I have a scheduled day off (I work freelance) as opposed to having no work makes me happy.
A few weeks ago, it was unusually warm and I was happy because I was able to go shirtless and drink tequila beer on the balcony in October

A good workout, great book, successful project, writing my novel, drinking tea, eating cake and watching Star Trek TNG

when my sports teams win lol!
Quality time with the missus, friends and family are all important. Knowing that things could have worked out a lot worse and thinking where I could have been had I not pulled my head out of my ass.
Finally, those days when I don't feel ill make me the happiest of all.
Years ago, I only believed I could be happy with profound occurrences, now I know better.