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Hi Shirely and welcome to MySwissAlps!
We don’t plan itineraries here but we can help give you some ideas so you can plan decide where you want to go and what you want to do. The best place to start is our trip planning section here.
Are you planning on spending the whole week in Zurich and exploring from there? I would suggest staying in two different towns if possible to enjoy your trip more. If you are primarily looking for mountain scenery here I would look at staying in Luzern and perhaps a town in the Jungfrau region as well.
To read about the Bernina Express trip click here. It gives you a general overview of the trip, the route the train takes and how to book.
If you have more questions don’t hesitate to ask!
Lucas