Aircraft.
I know two guys out here who are into 'planes and especially anything that flew during WW2.
There are magazines to buy, all manner of stuff, and the beauty is, you don't have to produce a thing - just talk about it!
Perfect. If you dig aircraft.
Photo clubs. Waste of time today, when anyone can have a virtual darkroom right there on the monitor. You learn more about photography (if you feel like it) from looking at books from the past, or even at Internet collections of old snappers' efforts, than any bloody club has either the wish or ability to offer. As for techie books - why bother? It's all freely available here on LuLa, with so many people perfectly happy to help out with technical problems. I have sometimes been referred to books for advice, but, however, I have the mentality that learns best from demonstration, by simple example of steps performed on a single image. This seems more likely to be found person-to-person online than from any book I have bought. I had an original Photoshop book and it was so opaque I stopped trying. I bought the Photographer's Guide to Photoshop by Barrie Thomas and that remains as opaque as did the Adobe.
To learn, I need: Step 1. > Step 2. > Step 3. > Etc. That works! Once understood it can be applied as required. Maybe it makes digital look too easy, so there's no future in writing books if you actually make it easy too.
Then again, there's the side to photography digital theory beloved in other sections of this site, where they constantly talk way over my head about this graph or the other and the importance of so many things that, AFAIK, bear no relationship to my going click! at what I hope isn't a millisecond too late.
So, for me, clubs would offer nothing, not even drinking clubs, unfortunately. But even those are not democratic: there's always the richer guy who feels obliged to pick up the tab more often that he should. Interesting the many ways of saying thanks, but you really shouldn't, I'll get them next time!
Aircraft seems safer.
Rob C