Hi there ;) .. here is what I always do and what no one else seems to be doing :
Whenever I enter a playground with my small son, first of all I clean the playground a little bit, remove the trash from the sand, throw empty bottles in the trash and so on .. unfortunately erytime I am at the playground it is a little bit more dirty then before ;( .. it is a bit annoying and I wish that people would take more care with nature and especially the playgrounds for our children !!