at the risk of sounding like a 9 year old... Fingerboarding is probably my favourite indoor chill hobby of all time. Not tech decks, i mean wooden mini skateboards hand made with metal trucks and bearing wheels. I got really into it when i was about 12 years old and still have a blast doing it now when I'm 18.
It is completely comparable to skating and every trick is hard as fuck, i mean there is no point where you're like "wow I'm too good at this" it is extremely similar to skating that way (just no danger)
A real fingerboard setup can cost anywhere from 40-150 bucks, like a skateboard setup... And the little details are completely noticeable when you use it.
I think the best part about it is that you can make up your own obstacles, do it anywhere, and be constantly messing around and working at something fun and relaxing. Also a great community that surprisingly isn't dominated by 10 year olds.
i'm sure you aren't gonna hop on this idea right away or anything but I wouldn't put it out there if it was anything comparable to what you would know as "tech decking"
Ill try and embed a video. https://www.newschoolers.com/videos/watch/801580/FlatFace-Fingerboards-Store-Session-December-2015