What about a day trip to Konstanz to change a bit?
Direct Train 9.37 from Zurich, arriving 10.54 (confirmed)
Please ensure you have a ticket before (this trip is in range of the GA)
So we visit a bit the city, and everybody is free to stroll
According to the size of the group, we'll go in the old town and a bit along the lake.
I'll check if there's some art exposition in the old town.
There is one about the zeppelins (this technology originated from around Konstanz) Link
There is also one about Escher (you know these special drawings with optic illusions) Link