Seriously, a sign is needed for this? I saw this posted in a public restroom this morning, at a park where I was joining a Dragon Boat crew for the morning . Here is a pic of what the water looked like

Seeing how dirty the water is, perhaps the toilet water is cleaner?

Oh, and the fine for smoking here is doubled to $2000 !!

Reference:
History of Dragon Boats: http://www.idbf.org/about_history.php
Kallang Riverside Park: http://www.nparks.gov.sg/cms/index.php?option=com_visitorsguide&task=parks&id=19&Itemid=73
American Dragon Boating: http://www.americandragons.sg/wp/