My main hobbies...

Model building - I'm quite fond of spacecrafts and the "robotech" style models and dioramas.

Graphic design - Building web sites, experimenting in Photoshop, creating images (on screen or "in the real world").

Mountain biking - Every chance I get!

But then again, how much free time do I really have? 10-hour days and being on call 1 week out of every 3 puts a tight clamp on available free time.

And I DO have to spend some time with my wife and kids eventually... >