Another nice forumtopic! I'll join in:
My reef aquarium is actually my primary hobby. It holds 600 liters of salt water and is completely stacked with corals and a few fish. I keep the fish count low so the water remains ultra pure at all times and the fish have lots of living space. The corals grow like crazy under the 800watts of Chineze full spectrum LEDS. And the pristine water makes the corals show all the colours they could possibly show. I'm always clipping them and creating frags to trade or sell of fellow enthusiasts. Currently I'm into automating everything as much as possible. I want it to function almost autonomously for our holiday next year. Requiring only daily checks from the holidays-assistant. And looking for automating-solutions and building things is almost a hobby in itself!
Some of my corals:
And then there's gaming. I grew up with computers and gaming and that side of me never really matured. Currently I'm playing the free-to-play Rift. It's a beautifully designed MMORG like World of Warcraft, only many times better, imho.
Reading: I recently discovered how many Star Wars novels there really are! I love them!
That's about it. I keep it limited, because if I have to follow everything that I'm interested in then I'll be sleep-deprived, broke and divorced in no-time.