How many writers here observe? Have you ever sat in a park and just watched how people interact with each other? How does a toddler handle a leashed dog approaching? A young mother with a crying baby? What about a couple about to kiss on the bench?
On a different note: what is the procession of colors as the sun sets? A smaller bird's reaction when a larger one lands beside it? And the glitter of dancing leaves as the breeze tickles through?
There's a lot out there for us to observe. Learn. Our research is right at the tip of our fingers!
What have you learned from your observations?