Whether the sand obliges seems to depend on certain factors, in particular whether it's wet or not. To make it whistle, it needs to be dry. If the conditions are right and you swish your feet over the surface, you will hear it whistle. Or perhaps it's better described as a squeak? However, Squeaking Sands, though probably more accurate, doesn't sound so good as Whistling Sands. :)
This time I tried taking a video so that I could record the squeaking/whistling sound.
Apologies for the quality, it's just taken with my Canon PowerShot which isn't a video camera, it just has a video option.
While I was taking videos, I also recorded the surf crashing onto the beach. You can hear the wind too. If you look carefully near the end, you will see the small black shape of a surfer heading for the beach.
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