All of these things can create a much more vivid picture of the world you've set up even if your story is not directly connected to them. Usually a lot of description is not needed. A few lines here and there to conjure up images of say what creative arts exist and which your characters enjoy would be enough.
I listen to a lot of music (especially classical) and find it very soothing. What do your characters find helps them "chill out" after a stressful day? And down time also, for me, means going back to the basics. Your characters are not "on" all the time - they have to eat, drink, sleep and so on. How do these things happen? What happens when your characters feel overwhelmed because they have had little chance to relax?
And now on to more of my down time as I write my next blog post...!