In Lucerne there's a quite nice café on the shore of Lake Lucerne (or Vierwaldstättersee) called Luz. Here I couldn't resist sketch people fastly while drinking my tea.
Then I met Urs Lauber to see how he conducts his Urban Sketchers' course. People sketching is great to sketch as well.
On the way home. On the train another opportunity to sketch people... specially when they are using the mobile!