Myrtle Beach Moment, No. 5

This notice appears on the playground at the YMCA in Myrtle Beach.
If I'm reading this correctly, it seems that supervising parents have to bring some appropriate play with them, but they need not worry about it before the school is closed.
Furthermore, inappropriate play is OK before the school is closed; however, I cannot tell if the inappropriate play is OK with or without parental supervision, only that it is allowable during hours of school operation.