Post Office Square
If you're not from Boston, you don't know about this great place. It's a park with gardens, walkways, a water fountain, trellises, benches, etc. all right in the center of the city. Just the perfect place to just slack back and do nothing. Unless, of course, it's lunchtime. Then you are forced to take in the "scenery". It is just impossible not too. I talked about eye candy before. Well, there's plenty of it here.
But...my favorite time there in mid to late afternoon when there are just a few people there and you can really let your mind go without distraction. Not easy to find a time during the day to just think. This is the place for it.