I would not exactly call it a hobby, but I've restored a 1979 Toyota Celica (with rebuilt Twin Cam 2 litre), a 1975 Toyota Hiace Van and ute, and finally a 1961 VW Karmann Ghia - restored from a wreck.
I USED to collect KISS memorabilia (and I have some VERY rare items)
I still enjoy Fishing, I just returned from Rye where we caught quite a few fish. I was RIGHT into the game - custom made rods and $700 reels