As well as astronomy my other thing is (international) travel, man now thats an expensive hobby.
Every 18 months or so I get the urge to head off somewhere this year after a few years procrastination Ive just booked for the worlds longest daytrip.
A 12 hour sightseeing flight Sydney-Antarctica-Sydney on FEb 18th.
http://www.antarcticaflights.com.au/
I'll be wearing my Ice-In-Space Tshirt.