Ideally, a playground would allow that development without exposing children to danger and injury. Replace those seats with a softer material. Equipment should have no rough or jagged edges. Any equipment at risk for falling over should be stabilized. Standing water and holes in playground surfaces are no-nos.
Bowers warns parents away from trampolines for any age at public playgrounds.
Asphalt, concrete or packed dirt should not be under any climbing surface. If you think there is some government agency that bullies playground owners and schools into complying with some standard of safety or a maintenance schedule, there isn't. Funded by the Centers for Disease Control and Prevention, Thompson's organization is working with the American Society for Testing and Materials and the Consumer Product Safety Commission to develop voluntary standards and guidelines for safer playground equipment. The American Society for Testing and Materials publishes technical documents and reports for use by playground equipment engineers, manufacturers and maintenance staff. The information includes performance specifications for playground equipment.