Thank you all for all your help so far. We are in lauterbrunnen now will leave for Lucerne and then Zurich. We have the Swiss travel pass. Are there any chocolate factories in / near any of these places. Are they covered by the Swiss travel pass.
Most of the big chocolate houses are in the French speaking part of Switzerland to the west, think Nestle.
There is a chocolate exhibit at the Swiss Transport Museum in Luzern, which I believe would be covered by the Swiss Pass.
There is also this place in the area.
Have a look at this place Interlaken - it may suit your need:
I haven't done the tour, the Lindt-Sprungli factory is near Zurich. My brother enjoyed it very much, and the factory is in a very scenic location on Lake Zurich.