Kit bashing.
Scratch building.
RMwebing.
LNER OO gauge.
Some LMS and GWR.
Building exhibition layouts.
Long walks in the snow at night.
Throwing rocks at campers and avoiding humans with cameras.
I don't know about anyone else, but I'm getting so fed up of these #@**!* adverts that I might find myself forced to resort to desperate measures - like model making, for instance.