One of the things that you see ancient philosophers and contemporary scientists agree on is that strong relationships are a key to happiness, maybe the key to happiness. People who have more strong relationships in their lives just feel happier.
Gretchen RubinTurns out that people who try new things, go new places, learn new skills, etc. are happier. This can be tough, because novelty and challenge also bring frustration and irritation - but if you can push through that, novelty and challenge can bring enormous happiness rewards.
Gretchen Rubin