walk in nature, go to the park if possible. watch birds and other animals. take headphones and listen to some tunes if you'd like
Also I'd recommend journaling or taking up any sort of writing. I may be biased b/c half of what I've been doing with my time lately has been poem writing, but taking up creative writing is so fun and full of endless possibilities. Best part is you don't have to show anyone if you don't want to b/c at the end of the day, you're ideally doing it for the joy of creation and the love of the game.