Take your camera and binoculars to get the best views of the city and beyond (although super-strong binoculars are in position on the observation platforms).
Find out about the building of and the ongoing developments at the Empire State Building.
Download the multimedia tour app (free with every admission) and connect via the WiFi within the attraction.
Buy souvenirs from the gift shop on the 80th floor.
Make note of the toilet locations (2nd floor) - especially important when travelling with kids!
At night when you are out and about in the city, look up and check out the lights of the Empire State Building. These regularly change.