If I may add...at rush hour (5pm). Watch the crowds fill up the place. The escalators up to the Met Life building are amazing. Like ants.
Then go down stairs and have dinner at the Oyster Bar (or maybe just a bowl of chowder).
and if you are there on a week end and the weather is nice, a walk in Central Park to see NYers in full bloom.
make sure you have a NY bagel and a slice of pizza from a street window pizzaria. The best!!!!
As someone who works in the area (and has worked at times onsite at clients in the Met Life building), let me say - please do not do this.