Please play safe: Penguin’s guide to playground safety by Margery Cuyler, illustrated by Will Hillenbrand.
Safety books can be deadly serious, dull and dismal, but this one has a broad sense of humor and will get kids giggling.  What more could be asked for in a safety book?  The book demonstrates first how NOT to be safe and then shows how to act safely on a playground.  When the dangerous way is shown, the text asks “Is that right?”  If you are sharing this with a group or even a single child, expect them to vigorously protest that it is wrong even though they are laughing at the very idea.  The pattern and rhythm of the book, its humor and participation aspects (as well as the potential for readers adding zany sound effects) make this a great choice for safety units in preschool and kindergarten.