I'm not so sure of hobbies anymore, since they tend to blur with 'honey-dos'. Guess it helps that I absolutely love working with my hands and getting gritty.
So I guess a hobby is home/auto repairs. If it breaks or acts stupid, if I can fix it, I fix it.
There is one that doesn't fall in the honey-do list: comp stuff. I really dig creating custom systems, either in actuality or just on paper, from researching, price matching, checking vendor reputation, reading customer reviews and feedback and computing tallies with shipping. When the budget allows, I actually get to order parts. *chuckle* Budget did this time, so I have a cpu, powersupply, and cpufan being shipped. All are upgrades to an existing system. I really love building custom systems though, and would rather do that than to buy a pre-built, even if it was cheaper. I like to know exactly what is inside the box, especially since some vendors like to sneak in PC-Chips (Piece of Crap) motherboards, or even worse, a PC-Chips knockoff clone!