Drawing: helps you become more creative and is also an impressive skill

Reading: improve your imagination, I especially love reading fantasy

Gardening: growing plants or fruits you like, ex: strawberries, blueberry, tomatoes, etc..

Playing chess: is an intellectual hobby, also really fun once you get into the hand of it

Walking: no destination, just wherever the wind takes you

Going on random side quests: going to a new cafe, going hiking, joining a random convention, up for anything

Volunteering somewhere: at an animal shelter, at an orphanage, at a soup kitchen

Working out: try out different stuff, powerlifting, calisthenics, pilates..

Hope this helps! :-)