I think band/music stuff generally speaking is my third place. It's really the only physical interpretation of a third space that can also be considered "social".
Thinking about your situation though, I suppose running is my most important "recharge" activity. It's not social for me though. Going to a park/trail and getting some endorphins in some natural scenery has a good way of releasing pent-up stress and all sorts of junk. I've been not-so-great at doing that with our 100-degree days lately.