Have a great time. I took my daughters to New York
for their birthdays last year. We bought 24 hour
tickets for a city bus tour at lunchtime so we could go
on a couple of the tours one day and do the others
in the morning of the next day, they're very informative
and I'd say the best way to see New York but best
done over two days. Also, go to the Empire State
Building early as the queues are horrendous by mid
morning. The queues for the boat trip to The Statue
of Liberty were also ridiculously long so we went on
the Staten Island Ferry instead, we still got good
views and photos of it.