About any cartridge-based system, but especially the Atari VCS (you never forget your first)
The TRS 80 Color Computer (again, you never forget your first)
Restoring and operating classic arcade and pinball games (and procrastinating instead of updating the website for my arcade...)
Collect Tron, Alien, and sorta Star Wars (don't collect much these days, but still love the originals) toys and others, as well as a huge collection of science-fiction novels
I also love to cook and bake