One of the cooler features at the San Francisco Conservatory of Flowers is a lily pond inside the building. If it’s not to crowded, you can walk right up to it and enjoy the view. Considering how many tourists see it every day, it’s amazing how clean and serene it is. Larger version viewable here.
Good to know I’m not the only one who thinks about this. AsapSCIENCE explains the finer points of public bathroom hygiene.