A few things most people don't know about unless they live in NYC
1 Rockerfeller center is going to be a mob it is kinda nice but in my opinion byrant park is much better, they have a big tree thats decorated, an ice skating rink that is free if you have your own skates, (you can rent some for five dollars)
2 Little Italy is also very nice to see they decorate the streets and its deff not as crowded as times square
3 A nice place to eat in times square is Bubba Gump, its a seafood place (they sell other things besides seafood) it has great views and it's cheaper than a lot of other places in times square.
4 Macy's windows are spectacular to see, IT WILL BE CROWDED, but deff worth the experience if you've never seen it.
5 It will be very cold like CursedCarolers said deff wear layers, thick socks, and comfortable shoes.
6 Above all have a great time enjoy the magic the city has to offer during christmas, it is truly a sight that everyone should see at least once.
HAVE FUN