Hm. Not too sure, both because my memory's a liiittle shoddy and also because I have frankly been very open book with the questions here. And I'm not sure what other people might consider "cool". Just gonna like, retread ground a bit and see if anything new comes to mind.
Got a 1st Degree Black Belt in MMA [when I was like 14, very out of practice], I longboard, I... uhhhhh... I'll be real nothing else is coming to mind. Man listen I spent a majority of my present adult life being extremely depressed and thus doing fucking nothing with myself as a person. I used to draw weapons for fun, and I had some really good designs I'd made, but I've lost the muscle memory for art and the motivation to get back into it. Still pretty depressed tbh. I used to have a pretty good grasp of anatomy too, but that is just fucking gone. I considered doing music production for like. A month, once. Never did anything with that either.
Sorry that this got depressing, but. I don't think I'm cool. I got extremely traumatized halfway through high school, in the middle of my Gifted Kid Burnout, and that burnout turned into a fucking inferno. The coolest thing I've done up to this point is survive it all. And that kinda fucking sucks.