Hello onguti,Since weather is always rather unpredictable in Switzerland, any time is a good time :-). As for the areas you would like to visit I suggest you browse this website a bit. Starting from the homepage you will find all kind of information. If, for example, you click "Bernese Oberland" a lot of tips will appear when you click the possibilities given on the upper side of the page. And so on...Maybe it's good to know that not all means of mountain transportation will be operational - the last week of November is a sort of in between seasons. The Swiss Timetable will certainly be of help.Lots of success, I hope this gets you started!