I think walking is the most underrated activity around.
No I'm not talking about when you're rushing about walking from A to B. I mean those precious minutes when you're alone with just your thoughts walking slowly through busy streets. You can see everyone around you in a hurry to get someplace and you can feel smug in the knowledge that you have no place to get to. You can fully appreciate each step, each sight, each breath that you take. I can think of anything more peaceful or calming than just going for a walk.
So if you do one more thing tonight, take fifteen minutes out of your hectic schedule and just step outside and wander around you area.