Having Low Expectations
I've learned that having low expectations for things results typically results in a happier life.
Think about it... if you come into every experience with high expectations, you're bound to be consistently disappointed. Most things won't meet your expectations.
But if you try not to hype something up in your head and just show up with no expectations you'll be pleasantly surprised most of the time.
It's a little hack that can go a long way.