Henderson park officials say Boulder Creek Park has been vandalized three times in recent weeks.
They say the vandals set three fires on the property as well as spray painting graffiti on the bathroom walls.
The city took to Facebook to try and see if anyone knows anything.
The fires happened last Tuesday, Friday, and Saturday.
"It's very disrespectful and you should not do something where children play," said Tessa Clark.
The vandals caused more than $2,000 in damage.