Just standing there and taking everything in was enough for me. Although a few of my personal favorites were:-
Coming out of the subway at MSG and looking up at the Empire State building for the first time.
The smell of fresh bagels mixed in with fresh pretzels and subway smells.
Almost any restaurant in Little India. There is a prevelant rumour that all the restaurants there share the same kitchen anyway!
Bar hopping in the village.
The view from Liberty State park towards Manhatten.
Ditto for the view from the statue.
Great bagels, pizza etc etc
Realizing just how small Times Square is!!
Central Park.....
Tavern on the Green...
The Met, just all of it...

I could go on,