Beer brewing. It's fun because it's a great mix of creativity and science. The possibilities are endless, you feel like you're constantly learning no matter how long you've been doing it.

It's also possible to achieve great results because your process can be really close to a professional one at a much smaller scale, plus it's easy to have access to the same ingredient diversity and quality as any microbrewery.

It's a great hobby overall but it's best to pair it with another one where you move. :)