Is it possible to do Italy & Switzerland in 3 weeks in May. I have been to Switzerland before and done all the tourist sites. I am mainly looking at the St. Moritz/ Lugano / Locarno / Chur area and the scenic Brusio - Pontresina section of the train ride, in 1 week. Are these very different from the Bernese Oberland, because I could happily spend 3 weeks in the BO itself, if I had the time. What should I must-see & what can I miss? How should I route my trip from Venice to cover as much as I can.