Counties Manukau Police and Auckland Council have concerns about sexual activity taking place in Murphy's Bush, an area which is used by young children and families.
Counties Manukau Police East Area Commander Inspector Wendy Spiller says the park is frequented by men who are engaging in sexual activity.
"The actions of this small group of people is concerning to us and the community, and we ask that people think twice before using Murphy's Bush for engaging in this kind of behaviour."
Engaging in offensive behaviour in public is a crime which carries a maximum penalty of $1000.
Committing an indecent act in a public place carries a maximum penalty of up to two years imprisonment upon conviction.