I guess these are passions rather than hobbies:
- Astronomy (did MSc at the Swinburne Astronomy Online during 2005-2009)
- model railroading, my Reunited Kingdom Rail is still in "planning & hoarding rolling stock and other stuff" stage
- other modeling, mainly manned spaceflight related (almost completely focused on collecting at this moment, no time to build while the LotR campaign is ongoing); also warships in 1:350 scale (although I've only completed one - CVN-65 back in 2004,
http://www.carrierbuilders.net/gallery/20050319_1_350_Enterprise_CVN_65/20050319_1_350_Enterprise.htm)
- home cinema & movies (sci-fi, fantasy, epics, classics, musicals, animation, science documentaries, ...)
...and in addition to those passions, I guess these categorize as mere hobbies:
- occasional board gaming (Arkham Horror, Mansions of Madness primarily)
- console gaming (games heavy on story like Mass Effect trilogy, Heavy Rain, Beyond two souls, Last of Us, Testament of Sherlock Holmes, ...)
- traveling
- cooking
- reading; mainly science non-fiction, but also occasional comic books (Carl Barks, Don Rosa, Alan Moore, Frank Miller etc), sci-fi & fantasy fiction, and model railroading books
It would seem that at any given time, only one of the main passions is in the forefront, and far less time is allocated to the others. It was astronomy during 2001-2010, now it's mainly the campaign and the associated modeling, with the model railroading chugging along slowly. But I always try to squeeze in a good movie or a short console / board gaming session just for variety...