My hobbies change depending on what I am interested in at the time.
Hobbies that I currently indulge in:
Jeeps/Cars (I just got done lifting a LJ)(Occasional unnecessary repairs on my vehicles. )
Autocross
Repairing things around the house ( I built replacement drawers for the kitchen, repaired 1/2 of the Colonial Door, Replaced water heater... I actually enjoy it if it's not an "Emergency" repair.)
RC Helicopters
Work (HA!)
Hobbies that I have indulged in and may revisit at any time:
Amateur Radio
Pistol Shooting
Model Rocketry (home made out of stuff around the house paper/cardboard/wood)
Creating Websites/moderating Forums
XC Skiing (Depending on snow cover)
Kayaking with my GF
Bicycle riding (pleasure, not "Sport")
Hiking/Sightseeing
Photography
Flying ( Well, actually, I doubt if I'll do that again... very... expensive )
Drag Racing (Again, more serious doubt... Almost as expensive as Flying

)