For Didierea Trolli, Cyphostemma bainessii and other astonishing creatures from the family of the succulents, take a stroll through the six glasshouses, situated a bit outside the city center along the lakefront.
Zurich is at its best in the summer, when swimming becomes part of the daily agenda. There are a variety of great places along the river Limmat, most of which are free and open to the public. When it gets too crowded at these, try to find one of the few hidden places along 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.