More than $30,000 worth of equipment has been stolen or damaged in the past few months, following an unprecedented spike in vandalism and theft.
Items stolen during these attacks include swings, memorial and artistic plaques and a flying fox.
Timber slats worth thousands of dollars have been stolen off benches and seats from Dawesville to San Remo.
Community and social development manager Tim Hartland said ruthless thieves were stealing slides and other items from playgrounds, leaving fall hazards and dangerous debris behind.
Expensive wire balustrading, providing a safety barrier from cliffs in Seascapes, was stolen. Mirvac replaced the wire and it was stolen weeks later.
Council officers suspect the offenders operate at night.
Mayor Marina Vergone said the City had ramped up its work with local police to tackle the issue but needed the community�s help.
�The disgraceful work of these thieves have had an impact on our community � not only the mounting cost but the effect on our community�s pride and enjoyment,� she said.
�There are many disappointed families unable to enjoy our playgrounds and reserves and it�s not fair.
�This is putting a sad stain on our community and we need your help.�