Yes, Switzerland is an expensive country. So, I thought I should start a thread with tips for things to do that are either free or a really good deal.
Here we go. The following offers are all in Zurich and all FREE:

- Kunsthaus (Zurich's main art museum, particularly well-known for the Holdler room (Swiss painter), the Giacometti collection (on the CHF 100 bill), but also some nice Van Goghs and generally a bit of everything. Tram Stop Kunsthaus (who would have guessed?). Entrance to the general collection is free on Wednesdays.

- Zurich Botanical Garden (nice to stroll around, but not too big), Zollikerstr. 107, 8008 Zürich

- Zurich Succulent collection (inside; the 20minutes reports when a special cactus blooms or so) Mythenquai 82

- Städtische Gärtnerei (Zurich nursery for flowers; I have not been there, yet, so I don't know how attractive that is) - Sackzelg 25-27/Gutstrasse, 8047 Zürich

- Drawings collection of the Zurich university, (mainly drawings and prints from the 16th to the 18th century, like Rembrandt or Dürer, but also modern) Rämistr.101

- Helmhaus (contemporary art), Limmatquai 31

Any other ideas?
Idgie