<human>: How can I tell if the sand on a beach is safe to walk on?
<bot>: The safest way to tell if the sand on a beach is safe to walk on is to check for any warning signs. Look out for broken shells, seaweed, or other debris that could indicate the presence of dangerous bacteria or toxins in the sand. Additionally, you should also look at the color and texture of the sand as it may vary from area to area. If possible, test the sand by walking through it first before deciding whether or not to use it for recreation.