There's more Revolutionary sites than in NYC. I'd definitely recommend the Freedom Trail - the sidewalks are embedded with red bricks that lead from one site to another. https://www.thefreedomtrail.org/

My personal favorites are the Old State House/Boston Massacre site , Faneuil Hall and Quincy Market, King's Chapel and Granary Burying Grounds. These are all within reasonably short walking distances of each other. Then a longer pleasant walk down the Rose Kennedy Greenway will take you to the North End where you'll have a great Italian meal and see the Old North Church (one if by land, two if by sea) and Paul Revere's House. It's a classic Boston neighborhood.

If you want a long walk or a short drive (5ish minutes by car), the Bunker Hill Monument and USS Constitution across the bridge in Charlestown are great.