Notice where the guide and the fisherman are walking.
If you are walking a beach looking for bones, walk on the soft sand above the sand wetted by the waves. This wet sand acts like a drum and conducts the sound your footsteps make much better to bonefish cruising the beach than does the dry sand. Sound when bonefishing is your enemy! Yes, it's harder to walk in the dry sand, but it is much quieter, you are further away from the water and you have a better vantage point.