Try 'top of the rock' on the 69th floor. It's got the one thing the Empire State doesn't have - a view of the Empire State!
Queues are infrequent at the Rockefeller, even on the sunset trip which was very popular.
You get great panoramic views right across the whole area and can stay for as long, or as little as you like. Doesn't get packed at the top and most people are courteous enough to keep moving so that everyone has the chance to snap good photos. The only downside is that the Chrysler Building is partially blocked by the horrible Met Life carbuncle.
At ground level, the whole plaza is a good place to chill out/ have a drink or food.
49th and 5th Ave, Midtown Manhattan
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