Aug 20, 2016 - 8:48 AM
in reply to Arno
If you are jet-lagged when you arrive, you may run out of energy by the time you return to Zürich.
I have never taken a bus tour of Zürich, so I don't know if you will find one at 4 PM or later.
An alternative is to walk arounf the old town on both sides of the river and along the Bahnhofstrasse. The old city is compact, buses and trams are frequent. The tourist information office (not the train information) which is located in the main station on the main floor can give you maps,and suggest locations to see, and which trams to take.
This map shows everything in the station......;-)
www.sbb.ch/content/dam /infrastruktur/trafima ge/bahnhofplaene/plan-zuerich-hb-a4.pdf#?lang=en
Look for location #109, on the right of the map.