Electronics 
You can get kits from Jaycar to make all sorts of things, like little transistor radios, etc.
Model planes 
Make them on cloudy days and you have something to go play with on sunny days and back to fixing them when they smash up on cloudy days. Yes, they will smash up every time you take them out
Learn some history behind war planes
Learn interesting things such as tactical warfare, and amazing missions flown - James Jabara's history is a great account as an example, not forgetting his famous run in between his Sabre and the Mig 15's in the Korean war. I couldn't find a you tube link for a doco on James Jabara's life, but maybe you'll have better luck finding it (the re-enactment of the Korean war fight is a particularly good watch). This guy went on to become American's first ace. And you wouldn't believe what happened to him in the end

Oh, and also don't forget about the incredible SR-71 (Blackbird).
http://www.youtube.com/results?searc...rd+part+1&aq=f This doco goes across six parts (look down the page a bit until you come down to the listing for the breakdown of these parts). You'll need about an hour to watch it though, but it's a great watch. Also the history behind "that"

B-29 piloted by Paul Tibbets. Great doco account of the lead up to this mission. Oh! I just found it on you tube
www.youtube.com/results?search_query=enola+gay+hist ory+channel&aq=f
If you get interested in this stuff, there should be plenty of war plane docos on dvd to watch and books for that matter.
To me, dobs and planes share a common thing, they're both shiny, long, sexy and aim for for skies
Scrapbooking 
You may be the only guy in the group, but you can learn lots of "secret girls business"


. And, you'll have the cutest looking astro obs book around

. Right, maybe that's not such a great idea then

But, seriously, you can do some great photo albums!
Learn to
ice skate
Learn
ten pin bowling
Learn and join a
bridge club
Make some great
slide shows on disc with your digital photos.
Fish Keeping (aquariums) A whole lot of work there which will keep you busy indoors. Learn to landscape tanks and breed fish.
I'd be interested to know if you end up having a go at any of the suggestions we have come up with.
Have fun!
Kind regards,
Suzy.