Ye gods.. have you got a while?
In no particular order:
-music
-Irish Trad music (special enough to my heart to have it's own category)
-Scottish Trad music (see above)
-genealogy (apparently I'm mostly Scottish, Great-Grandfather was from Scotland)
-4X4s of any sort
-motorbikes (most anything but Harley. They suck, mostly owing to the typical Harley rider's attitude. Oy, and BMW guys are about the same)
-reading. Presently working through Heinlein's works again
-writing
-bicycles (haven't been on one in years, trying to get mine back together so I can get some serious mileage (and my weight) down)
-RC vehicles (land/sea/air) with an eye towards telepresence
-HAM radio
-technology
-shooting
-gunsmithing
-reloading ammunition
-casting bullets
-diesel engine tech
-Waste Vegetable Oil mods/research for above
-touring (motorbike/4-wheel-drive). But who can afford it now with fuel the way it is?
loads of other stuff I'm forgetting, no doubt
EDIT:
-redheads. Oh.My. GOD YES. REDHEADS!!! Goodtime party girls!!

.. and Of Course-- PORN!