[yubiox]

Skydiving. Nice hobby, lots of people to hang out with, go eat together after. Plenty of time to talk between loads. After a while you end up having friends all over the world, and you are welcome at a dropzone anywhere. There are quite a few different disciplines within the sport, from high speed to low speed both in freefall and under canopy. There's always something new to learn or practice and people to do it with. There are events organized all over the place, often around holidays, where people gather to jump.