This may be too obscure a reference, but I’ll try anyway: What’s the Doug score?

Ymmv, but I night ride on my MTB and it depends on the park whether it’s being enforced or not. I regularly ride at a park way past dark and have several times seen the police drive right past me and not say a word. And the places where they do, I’ve only been told to leave without so much as a written warning.

I see those rules a way to guarantee probable cause when they suspect people are up to no good at a public park at night (and chances are, they’re right). It’s still a risk, but one I’m willing to accept.