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Boston is the capital and most populous city of the U.S. state of Massachusetts. It serves as a cultural and financial center of New England, a region of the Northeastern United States. Boston has an area of 48.4 sq mi (125 km2) and a population of 675,647 as of the 2020 census, making it the third-most populous city in the Northeastern United States after New York City and Philadelphia. The larger Greater Boston metropolitan statistical area had a population of 4.9 million in 2023, making it the largest metropolitan area in New England and the eleventh-largest in the United States.
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A Boston list for Faneuil Hall Marketplace, the Freedom Trail, the North End, and the waterfront.
Boston is one of the most walkable cities in the United States, with the Freedom Trail threading the old-town core. Stay near the old center, walk the pieces that interest you, and let the waterfront be the release valve.
Faneuil Hall Marketplace is the market hall and surrounding pedestrian blocks near the waterfront, a stop on the Freedom Trail and a working food hall. It is useful as a landmark and an easy food fallback, but I would treat it as part of a walk rather than the entire plan.
From there, keep moving on foot: Government Center, the North End, the Paul Revere Mall, Old North Church, and the harbor form a compact route that does not need a car.
The MBTA Subway is the practical T layer when walking is not enough: Blue Line for Logan Airport via shuttle, Red for Cambridge and South Station, Orange for Back Bay and North Station, and Green for Fenway, Brookline, BU, BC, and the museum side.
For the old-city route, I would still walk first. Use the T for the cross-town moves, not as the whole itinerary.
I would start around the market, cut toward the North End and Old North Church, then finish on the harbor instead of doubling back through downtown traffic.