One man's job is another man's hobby.
Here's a few that I've enjoyed in the past and/or currently.
Skiing (snow & water), motorcycling (on & off road), boating, flying, photography, gardening & plant breeding, tropical fish raising & breeding, construction (our mountain cabin & glass studio), woodworking, pottery, welding, rebuilt a 1967 Corvette.
Glassblowing (which became a profession for a number of years). Built all of the furnaces, annealing ovens, polishing & grinding machines for the glass studio. All of the equipment is relatively simple to make, but would cost 10 times the material cost to purchase. So, $10K DIY equals $100K ready built equipment. I enjoy making stuff.
I'd like to learn to kiteboard, try thundercat racing (inflatable catamaran), learn to fly a glider, try hare scrambles (a type of off road motorcycle racing), and scuba diving. I'd also like to try cruising the Caribbean, which I guess would fit in well with the scuba, kiteboarding, and the thundercat. Hopefully, some of these will fit into my future sooner than later. :)