Well, I lived in and around Boston for fifty years. It’s a major city. No major city can be thoroughly toured in a day, so that is an odd thing to mention. I have never heard it called an Urban Jungle before, not sure what that means. It is easily walkable, from the pier to the Freedom Trail to Boston Garden, even to Fenway Park if that’s your goal. And the MBTA is cheap, clean, and runs to all these places. Not in a day, but in four or five days. Plus amazing museums, if you have more time. And we haven’t mentioned the harbor and islands,
I love Lexington and Concord, but the density of attractions there is nothing like what you get on the Freedom Trail. You DO need a vehicle to see them. And Salem is great, once you get past the kitschy With tourist traps.
I don’t see any such traps mentioned in your post for Boston, and if Faneuil Hall is closed, well, that’s not 10% of the historic attractions in the city. 90% of visitors don’t even go there, they enjoy the shopping and food and entertainment at the adjacent Quincy Market, which has not been closed. And yes, I worked there and I know the numbers. I think you are confusing tourist “traps” with tourist “attractions”. Fisherman’s Wharf and Plymouth Rock are tourist traps. Not the Freedom Trail.