It is pleasant to walk down the street when it is full of life. To make it full of life, it is necessary that there was something to do in it.
And for that there should be active fasades, and not empty walls, so that people could come in and do something interesting for them..

If there are no facades, there must be at least street trading sites around.

In New York There are lots of them…

In New York there are shops everywhere.

Flowers are a separate issue altogether

There are lots and lots of them and nobody touches them.

Sakura

Tables, benches. It is very pleasant to sit with a computer or read a book.

Breakfast, lunch, afternoon tea – all in the street

But the main thing, of course is portable chairs

They are everywhere.

This chair costs about 11$

Bryant Park

Flowers, chairs and a huge lawn. Always a crowd of people

Source