This is a notice that I saw it in the middle of nature for couples (boys & girls) who would like to hike or ramble in the bosom of nature.
It says: "The world is place of God, so please do not make sin".
What it tries to say in this please do NOT make a sin in the bosom of mother nature, because God is there, always.
I should mention one of the entertainments of youth without any official observation would be meeting each other in the middle of nature !!!