Well we know they got together to discuss matters in the Jedi Council. I could easily see you creating a Jedi Temple Scene of some sort. Also, I figure they did get together to eat lunch in said place. I wonder what the Jedi Temple Cafeteria looked like before they destroyed it?
I could also see them getting together to do light saber and force training. I could see a martial arts type dojo scene with em in it. Just kind of thinking out loud. I just sort of envision jedis using their downtime to get back to nature, but keeping it simple kind of like you would see from a Japanese Samurai kind of thing, if that makes sense.