Does red means you can't do it? Or does green mean you can't do it?

I saw these two signs, on the same pole, in a Vancouver park today. Normally the colour red is used to indicate danger or to tell people that some activity or practice is prohibited. And as I tell my four-year old, "green means go".

Using the colour red on the park closure sign makes perfect sense. So why would the parks department use green on the sign to tell people that golfing is not permitted? It goes against every convention is colour usage in North America. And if you don't read English it is quite conceivable that you could think that golf is permitted in the park.

But everyone in Vancouver reads English, don't they?