One of my main "free time" activities (non tech related) is bicycle riding. I do road biking, mountain biking and BMX to varying degrees. I'm also looking to start getting back into trail running with an eye towards eventually running an ultra-marathon.
Otherwise, I spend a lot of time reading, both techie / business related stuff, other non-fiction, and fiction. I read a lot of science / history stuff that isn't strictly tech (for example, I like reading about cosmology and particle physics, and WWI / WWII history).
I'll go to the occasional concert, mostly heavy metal / hard rock stuff of various sorts.
And then I'll throw on Netflix or Amazon Prime here and there and watch a movie or something now and then.