I haven't been there enough to give good advice on places to go. I do think that you should go to Rockefeller Plaza when the Today Show is on and bring a sign saying hi to your girls at JM!!

I would definitely bring some sweaters but also bring clothes in case it is warm. There's always a chance of a fluke warm patch of weather. Chances are, though, it'll probably be fairly cool. Also, make sure you have comfortable shoes!!!
Have a GREAT time!!!