The driving distance between NYC and Boston MA is 215 miles -- almost 4 hours in the car.
To reach any other part of NY State from Boston is about the same minimum driving distance/ time.
To get from Boston to Niagara Falls is a lot further (Niagara Falls is pretty much the far end of NY State from MA). It's a drive of over 6 hours, about 467 miles.
That's for the US side of the falls; they are supposed to be better viewed from the Canadian side, and that's a few km / miles bit further to drive.
To reach any other part of NY State from Boston is about the same minimum driving distance/ time.
To get from Boston to Niagara Falls is a lot further (Niagara Falls is pretty much the far end of NY State from MA). It's a drive of over 6 hours, about 467 miles.
That's for the US side of the falls; they are supposed to be better viewed from the Canadian side, and that's a few km / miles bit further to drive.