Hot Dog,
Sory dude, waaaay wrong. I live in the Sai Kung country park. Every Monday morning or after every public holiday every single BBQ area is awash with an enormous amount of litter. The culture is not about cleaning up after yourself - kids are not taught it as what should be done. The streetsweepers will do it.
Comne have a look at about 7am on a Monday - it will open your eyes. And hats off to the streetsweepers for the great job they do cleaning up after Hong Kong's pigs.