Video games and board games for me, especially strategy games or tricky action/puzzle games. On weeks where I don't play them I get a lot more irritable, and I pretty much completely forget the outside world while I'm playing them.

Walks in nature also do wonders for alleviating my mood. I've actually started taking outdoor walking breaks at work since the circumstances of this year lead to a lot less opportunity to walk out in nature than usual. This is also why I try not to work in a major city, because I need to see trees, grass, and hopefully flowing water on a regular basis.