Did you mention WHEN you will be in Boston? Sorry if I missed that info..
We are on the Cape for the summer. Last summer our son and friend came up and we did Boston 1 day in July. The Hop On/Off trolley was full at every stop. People were afraid to get off as you could not get on when the trolley stopped to pick you up.
But have taken it lots of other times in lots of cities, and it is definitely the way to go.
Hopefully you have time to read some books first before you come or see the show on John Adams done by HBO? SHOWTIME? Etc a few years back..
Really adds to your trip.