In Boston we took an excursion independent of the cruise line. It was the beantown trolley and harbor cruise. Overall it was a great day in Boston but I did notice that the red bean town trolleys were very few (small company) veersus the green hop on hop off buses that were everywhere. As such, be aware that trolley stop times can very significantly from what is published.
Took the #67 city bus to the cliff walk and explored on our own. Had a wonderful lunch at the Newport creamery in Newport.