Personally: Hiking, biking, photography, DnD, and fixing things.
It sounds like a lot (because it is lol) but with ADHD having a group of hobbies I can orbit around (especially if they can overlap (like these ones))can help me avoid diving into too many new hobbies.
My main hobby is critical listening (aka listening to music like a pseudo-audiophile)
Some other hobbies I have include watching cartoons, music production (still really bad at it), and collecting old electronics.