We'll be doing mostly mountain hiking during our 13 day Swiss holiday..
We'll have 2 days left for one city exploration..
We love City with culture.. not too keen on modern buildings etc...
We prefer walkable city with old towns...
Being from US, we try to stay away from skyscrapers and needing metro to travel everywhere..
Out of Luzern, Bern, Lausanne or Geneva what city would you recommend for our city explorations..