There are hobbies I already make time for. Writing (non fiction), dev, tech and finance related stuff. Things that directly help my life professionally and personally and those around me.

Then there's the hobbies I suck at or have never gave an honest try. Those are the ones that'd get unlocked by financial independence.

Music comes to mind first. Actually a big part of my life but solely as a consumer and wannabe connoisseur. It'd be nice to be more than that and actually produce or play some. It's also a long running tradition in my extended family. All my uncles, grandpa's used to play something, some in marching bands. I'm the black sheep of the family so it'd be one thing to keep some ties and keep a tradition going.

Writing (fiction), harder because English isn't my first language and I need to read and write a lot more to get up to speed.

Adventurous stuff like travels, running the iron man or spartan race, skydiving, etc. My friend really wants to get me into Warhammer. I said I'd give it a shot if he learns about Bitcoin the proper way. Still waiting :P