I'm currently visiting NYC
yesterday the queues outside the Met were awful when I arrived so a quick change of plan involved the Cooper Hewitt, the Jewish Museum and then the Museum of the city of New York all a short walk from each other up 5th Avenue. I could have squeezed in the Frick but had plans to meet a friend.
there are literally hundreds of museums and galleries in NYC A little research in advance pays off when you need to change plans - which is why I was ready with Plan B yesterday.