But, yeah, when I'm in town fulltime, I do about a 2 hour MTB ride on Sat. mornings, weather permitting.
And, during football season, I do take out time to go to a sports bar and watch the Dolphins game on Sundays. But even then, I take my laptop so I can work during the breaks, or if the game turns into a blowout.
Beyond that, though, not a whole lot. I'm almost 40 and I'm running out of time to achieve some of my dreams... so it's pretty much "nose to the grindstone" right now.
But like I said... everybody needs a break every now and then. I will infrequently just take a random day off and do no startup work at all,and just kick back and watch movies, or go to the hackerspace and tinker with some Arduino stuff or something. I don't do it very often, and I feel somewhat guilty when I do, but I usually feel a bit recharged after one of those days.