Last Updated: 14th Nov 2013
The trolley tour of Boston, offered as an optional, is the best way to see the entire city. Take it at your own pace, but I would suggest stopping off at the USS Constitution and Fenway.
I went on two tours alone...I made life-long friends along the way! That's the nature of Contiki.
Definitely worth doing if you are in any way interested in Ancient Rome - the guide is a wealth of knowledge.