We booked a couple of day trips with Keytours SA, one of them being to Montreux, Vevey, Chillon and the Chaplin museum.
Thoroughly enjoyed the day, thanks to our guide Yolanda who was friendly and very knowledgeable. We also got lucky to have a very small group on the day :)
Keytours run a very efficient ship, the tour started on time and went according to plan. We got time to explore on our own and take pictures. The transportation provided is comfortable and safe, and brought us back to Geneva on time.
I would certainly recommend their services!