Have an embrace-the-silence Sunday. Turn off everything. No TV, no radio, no ring tones, no cars. It'll be good for the soul.
This was bliss, but surprisingly difficult. I didn't think I listened to music as much as I do - especially the iPod (I have it on every time I'm out). It was really lovely to be out and about with no music or anything - a walk in the park to the sound of birds is so much nicer than when it's accompanied by Podcasts and music.