I just had my cousins' three daughters visiting, and I was truly amazed at the good deal I got: As I have a Halbtax (same is true for GA), I can take up to four children up to 16 years with me on a full day ticket for CHF 15 each. This is valid for trains, ships and all, but not for the privately run mountain trains (for which, however, you get a better deal if you have this ticket). So, basically, they travelled around for CHF 45 per day, as much as we wanted. This ticket is called Kinder-Karte.

On top of that, I used the Migros voucher book which you can get as a Migros member (and which does not cost anything), and which gives further reductions.

Enjoy
Idgie