My spare time is spent playing with Matchbox Cars and Thomas the Tank Engine trains. Actually, whatever my two year old is into at any given time is what I spend my spare time doing. I consider anything outside of work spare time and I don't mind playing with him at all. Might be different if I had a daughter. Don't see myself having as much fun with Barbie dolls :p
Any spare time not spent with my son is generally spent on my TF colleciton, playing Final Fantasy XI or spending time with my wife.