This photo of some of NYC's great Christmas decorations located along Fifth Avenue was taken when I was there visiting my daughter. I used a ND filter and stabilized my camera by setting on a bench, in order to produce the smoothing effect to the water.

Nikon D800
Nikkor f/2.8 24-70mm lens
.5 seconds at f/22
Focal length 32mm
ISO 100
ND filter