thanks everyone for so many responses
i had wanted to travel in Dec. to get a "christmas" feel there
but looks like we'll have to travel in November - does anyone know when Thanksgiving is? - suppose I should avoid that time - would it be a bad time for shopping/sightseeing???
also, one more question - is Aer Lingus to JFK the best way to go -
return flights for 2 total cost €740 - is that good value??
Thanksgiving's the 4th Thursday in November. It's a bigger holiday than Christmas in the US. Shopping? the day after (Friday) is the biggest shopping day of the year in the US, plenty of sales etc., but v. busy everywhere. So plenty of bargains, but plenty of crowds to go with it: you take your choice. As for cost, you might find it cheaper to stay there that week-end, as it's very much a family holiday (i.e. people tend to go home rather than away). It's hard to say for definite though.
I was in New York at that time a couple of years ago: you'll certainly get a "Christmas" feel around that time (decorations etc., skating at Rockefeller centre etc.), but especially after Thanksgiving's over.
By the way, there's a big parade on Thanksgiving (run by Macys): well worth it if you've kids with you (and maybe even if you don't!).