NYC during Christmas is awesome! I live in Rochester, NY and I love going to the city this time of year. All the fancy department stores have amazing displays, so it’s fun to browse all of them. And if you’re in upper Manhattan you should go ice skating at the Rockefeller rink, just to say you did. It will take a good chunk out of your day, so plan 3-4 hrs for it. And go get a Frrrozen Hot Chocolate at Serendipity (the actual place they filmed the movie & the cutest little restaurant ever!) They usually have ridiculous waiting times (like 3 hours) so put your name on the list, go get lunch somewhere nearby, or do some browsing at Bloomingdales, and then go get your dessert. 🙂 https://www.serendipity3.com/location.htm

Hope you have a great time!

Take the #4 (green) subway from Grand Central to Union Square/14th Street, then the N-R (yellow) to the 23rd Street station. You will NOT regret it :).