Hello Jenny,
Well done on booking your first trip. I have not been on this trip, there are plenty on here that have. Should be reviews as well to give you a taster. I have been to New York, Plymouth and Boston with my family. Plymouth is amazing with the 'stone' that they stepped down on for the Mayflower which has a replica in its place.
Boston has the Barking Crab which is a great sea food restaurant near the Aquarium, we caught a boat from there on a whale watching trip which was one of the best things I have ever done, if not the coldest 🙂 There is also the Pilgrim Walk and you must see Paul Revere where he signaled that the British were coming. We went across the Cambridge River to Harvard on the Metro- a great city.
Jan