There is no way you will miss the lake when you visit Zurich. The city situates around the lake and it is one of the primary hanging spot of locals(at least when we visited in the summer). There were people sun bathing, swimming, boating, bbq ing in an around the lake.
We did some boating enjoying the view of the city in another perspective and then walked around it, and rested on its shores putting our legs in the cool waters. The water is clear in most places with a turquoise color. And there are many restuarants around where you can have a meal. In one of the corners, people were jumping off from a ten meter tower to the lake below. Looked like all the locals were having a great time there.
Visited on Jul 2018