Suspect that once the percipitation fell, it froze, creating a layer of ice under the snow. That's why it's so slippery.
Walked up to the beach and fell flat on my back in front of some complex that must have done some sort of cleaning that ultimately did just that. Was hard getting back up because it was so slippery. Ended up walking in the street because it was much safer. Not like there was any traffic either. Made sure that I avoided that particular sidewalk on my way back.
Cool seeing a beach full of snow all the way up to the ocean... and having it all to myself.