The old botanical garden is my favorite green island in the city center. Thanks to a collection of moveable wooden chairs, it is an ideal spot for reading or having a chat with friends. The park is surrounded by office buildings and the Schanzengraben: a moat that serves as a hidden promenade from the city’s very center all the way to the lake.
I like this place to cool off during hot summer days. Have a short walk upriver and let yourself float down by the green and fresh water, sourcing from Lake of Zurich. If you have the guts, throw yourself down the crossing bridge.
The Hardbrücke is a long, brutal concrete bridge that runs through a former industrial area. I like the view down to the rail tracks and the many construction sites. And, within spitting distance, you can find a few good places to spend a nice evening, such as Helsinki (for concerts), Rosso (for pizza), and Les Halles (for beer and tapas).