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.
Making things, mostly.
Lots of crafts like knitting, crochet, cross stitch, sewing, felting, origami, faffing about with clay, etc etc. And gamedev which I basically think of as the same sort of hobby because it’s just making a different sort of thing.
Making YouTube videos about all of the above, in defiance of the algorithm gods.
Reading any and all scifi I can get my hands on, plus the Discworld series just over and over again endlessly on a loop.
Also the amount of time I spend on Mastodon and Lemmy probably means it counts as a rather lame hobby at this point…