We tried this convenient way to see a lot of Boston, and it takes about an hour or so to go around the loop. The best part of our senior ticket was the free second day to do it all over again and we chose the free harbor cruise option. You can get on and off at 16 planned stops, all day long. We went to the farther out stops to explore the USS Constitution area and Bunker Hill Monument ( unfortunately both were closed due to the government shut down) but we muddled thru and had a great experience anyway. In the south west part of town we went to the Prudential Center for the Skywalk Observatory. We really enjoyed the Old Town Trolley Tours experience and they did a great job. The driver guides had a pretty uniform patter for each stop and the second day we knew what they were going to say, but we still laughed at the jokes, and they had wonderful individual personalities.