When we visited Boston a few years ago we stayed in a suburb south of the city. It was just a block away from the train station. But the trolley picked us up at our motel in the morning and brought us back in late afternoon. We rode the trolley from site to site. There is still a lot of walking though. I remember that public restrooms were hard to find. We ended up walking into a fire station and asking to use the restroom. They were very nice.