I went out for the summer streets today (last one) around 10am. Rode all the way to Chambers st., then crossed to the west side by the Hudson. Honestly, the summer streets was not as enjoyable as riding on the Hudson Greenway or East River bike path. There was no car, sure, but it was very crowded with bikes (also a lot of joggers and pedestrians), many of them didn't know the basic etiquette, zigzagging between left and right, or stopping abruptly in the middle of the road when others were right behind them.
So far, my most pleasant ride was the evening ride (after 8pm) along the Hudson Greenway. Few cars, few bikes, few pedestrians, breezy air, night view of the Hudson and Liberty. That was tranquility.