My 18yo son is about to embark on a 7 month trip ending in New York. We are hoping to fly out to join him at the end of July with our 13yo and then travel up the East coast after spending a couple of days in NYC. I think we'll have 2 weeks and I was hoping to travel up to Boston. We like a combination of city and beach and wondered if anyone had done this sort of trip and had any recommendations? I don't want to spend all the time in the city as it will be very hot!