>> I have 2-3 hours in Zurich on Day 1 morning. I will be staying near the airport. Do you have any recommendations for things to do there?
Something to consider would be to get the train or tram in to the centre of Zürich, walk through the Niederdorf area of the old city down to Bürkliplatz and catch a boat for a short round trip on the Zürichsee (Lake Zürich).
Start the walk at the tram stop called "Central". Tram #10 from the airport stops here, but Central is also close to Zürich Hauptbahnhof (main station) if you come in by train.
From Central, walk along Niederdorfstrasse. This is a narrow pedestrian street with interesting shops, restaurants and cafes. Further along, it becomes Stüssihofstatt and then Marktgasse and then Münstergasse, but you basically keep walking straight ahead.
When you get to the Grossmünster (church with twin towers), cross the bridge over the River Limmat and turn left down Stadthausquai in front of the Fraumünster church. Then go right in Quaibrücke to the wharf at Bürkliplatz to catch the boat (see attached map).
If you have time, visiting the Grossmünster and the Fraumünster Kirche is well worth doing.
Take a "Short Round Trip" cruise from the wharf at Bürkliplatz. This will take about an hour and a half.
After the cruise, you can get Tram #11 (travelling in the direction of Zürich, Auzelg) from Bürkliplatz to Zürich Hauptbahnof (4 stops, 6 minutes) to catch the train to Wengen. The tram travels down Bahnhofstrasse, a famous (and expensive) shopping street.