I went to Zurich last month. But it was just a 3-day-business trip. The area around the Zurichsee (Lake Zurich) is quite nice for an evening walk. Apart from that the āBahnhofstrasseā is a famous shopping street in Zurich. Itās close to the main station, ie Bahnhof.
Well not sure if this would help but i would suggest taking the car down from Bern to Geneva. The road trip is great. I would suggest sun set time as at that point when you are on the swiss alps with Lac Leman at your foot and the sun setting. Its ****ing breathtaking.
Up in Interlaken or rather Grindalwald you have frozen ice caves. You have white water rafting. You have the revolving resturant in Schilthorn where a James Bond movies was shot. That resturant is good, not great food but great view. Right in the middle of the Swiss alps.
I would suggest for your three days spend 1 day in each area. The French, German and Italian. Lugano is great but to far away. I would personally suggest Sion and Cran Montana. Davos is good fun but only if you have a summit or something.
Cities worth seeing in the summer are:
Bern (they have a great rose garden it is beautiful and the old city is what 800 years old. The streets are still cobbled which is great).
Geneva (my home town so i am gonna be biased)
Montreaux
Zurich
Chur (but too far away if you are going for 3 days)
Lugano.
Aarau, Basel et al suck big time.
I lived in Switzerland for 6 years so if you need help with anything PM me.
I visited Switzerland for 2 weeks last summer,
Landed in Zurich, rented car ( from Kuwait Avis ) and drove to Nendaz resort in the south, 5-6 hours drive. It was excellent. the people are very friendly .
Also to the resort in Alpine resort, All up in the mountains , breath taking views, hiking ...etc
drove to geneve, lousane , veevy, montrex, (sion - drank water from a natural fountain in the church zone , excellent water )
Found difficulty in food, since we were in resort , we made our own food and carried with us .
day starts fron 4 am till 10 pm
Just be careful from the sun, wear Pcap , there is a type of flu with extreme fever. The rest is great!!!
Good luck