My recent hobby after almost 20 yrs without is now maintenance, and upgrades to my "new to me" Ktm 450 exc. I bought it in China, and also bought over time a pretty full set of tools. It's a 2004 that needed quite a bit of TLC (tender loving care), now it's about 90-95% ok now. Of course riding it is a hobby as well. Recently replaced the flywheel with a slightly lighter one, changed the gearing with new sprockets, changed brakes, cables, moded the carb, etc etc etc.

Another hobby that takes me in the garage is R/C. I have a nitro 4x4 truck, a .25 size trainer plane and a .46 size bi-plane. So R/C in general, still need to get a heli and boat etc.

I play drums as a hobby, not pro but not too bad.

I see comments about custom choppers, me and my german colleague have a crazy idea (fairly serious crazy idea) of trying to do that in China. We have one frame welded up and have located alot of parts here in China.