Do what makes you happy in the moment.

I have a huge backlog of projects on my list. Many of them "feel productive" -- they result in betterment of some career skill, or they could turn into startups. But I also like to surf, I've been doing it my whole life. That's a skill, I'm trying to get better, but it's also just a pure experiential thing, a lens through which time passes. Surfing has no point to it, you paddle out, and then ride a wave in, and then paddle out, in a big loop. There's nothing produced, no tangible result. You can surf for a lifetime and never feel like you're actually good at it, and every time you go it seems like the culmination of your whole surfing life is just another 10-15 seconds of riding that single wave. There is no "done".

Sometimes, in the past, when the surf has been really good, I've chosen to work on my projects, instead of go surfing, so that I can gain some abstract "productivity."

The lesson I'm learning as I get older is, that's dumb as hell. Go surf, there is no "done"!