Boston is a walkable city, so the best way to get around is on foot. Wear comfortable shoes and dress for the weather, as the city can get cold and wet in the winter. If you need to travel further, consider taking the subway or using a ride-sharing app.
If you want to see more of Boston's historical sites, consider spending an additional day or two. If you're short on time, skip Quincy Market or the North End, and focus on the Freedom Trail and Paul Revere House.