re: New York City - suggestions on what to do

If you are only going to be there for 3 days at Christmas, I wouldn't do a museum, unless it is the 9-11 museum or MOMA, which won't take up a whole day. Book tickets now for the Rockette's Christmas Spectacular at Radio City. Take a horse drawn carriage ride through Central Park and stop at the skating rink. Also see about an evening Broadway show. Go to Rockefeller Center to see the Christmas tree and the skating rink. Then walk out to Fifth Avenue and take in the holiday-themed store windows. I agree about doing Top of the Rock, but get tickets in advance. We like the Upper West Side...if you are a foodie, Zabar's is a must.