Has anyone visited Zurich, Switzerland?

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My family and I have booked tickets to Zurich for next month, May for a week's stay. I know it is very expensive there. Can anyone tell me how much does a Macdonald's meal cost per person? What is the weather temperature like in May? What to expect, to do and any interesting places to go in Zurich? Any tips for cheap affordable meals, etc would be greatly appreciated! Thanks.