1) Boardgaming:
https://boardgamegeek.com/collection/user/Wylann
Don't get to do it much these days, so I play over the computer (or mostly just play computer games).
2) Motorcycle racing:
Race Bike '09 Ninja 250R
That's my second most expensive hobby.
3) Flying is my most expensive hobby, and I don't even have my license yet. I have friends with planes, and pay for the gas, and basically they let me fly everything except the landing, and sometimes the takeoff.
I have also done some dogfighting and aerobatics, which is
really expensive.