1. Board Games (Collecting and playing. I mean REAL games that make you THINK, like hex and counter wargames, Chess, and other thinking games, not those crap games like UNO or Monopoly)
2. Role Playing Games (Dungeons & Dragons, Paranoia, Twilight 2000, Marvel Superheroes Role Playing game from the 80's...old school
)
3. Making experiemental music
4. Circuit bending various electronic things to turn them into experimental musical (or non-musical) instruments
5. PC games (City of Heroes, Silent Hunter III, Dangerous Waters, all the Naval Combat Pack games, Neverwinter Nights, Harpoon III Advanced Naval Warfare, etc...)
6. Collecting books (Sci-fi, fantasy, theoretical physics, comic books of the Marvel variety)
7. Coffee, espresso, coffee houses, Starbucks, etc...
8. Drumming in drum circles (GREAT for exercize and not quite as hippy as you would expect... most of us are ex-punk rockers)