Cars
I enjoy working on cars.
Learning how engines work, and maintaining vehicles.
I always believe that working on cars makes you an eletrician, plumber, and a carpenter (if you mess with interiors..)
See my Cars
Computers & Electronics
Building, repairing, and understanding computer hardware and electronics.
Also, sometimes reverse-engineering things.
See my Computers
Exercise
Staying active, lifting, and maintaining physical health.