Some times..... seeing the cows in the field brings a happy feeling to me.
It is not the only thing, and yes it may be simple, but at the same time, it is peaceful.

Just noticing some nice nature around me too can make a happy feeling for me....

My cat makes me happy,
My S/O can make me happy some times I don't know some days what I would do with out him

Sometimes, that "f it feeling" and me actually not stewing and being anxious about things or angry or what not.. just "f it"..... I guess in away, but not entirely, Living in the moment some say, not in the past or future.. It comes at times, I wish I could get it to come more often though.