Hopefully to either see the city decorated at Christmas or for the parade some day (my SIL was thinking about taking the girls to the parade this year, so maybe then?). I haven't been to the city at Christmas myself, I think the earliest I've been was in March, and then mainly in the summer months. I love it there, so I really hated not going between 2011 and 2024. It's really easy for us to get there - it will be around $250 for all three of us to take the train up.
I think we could do three nights if the Statue of Liberty and the WTC were the same day, but I think that might be too much for one day.