What are the best places to visit at Zurich ( Switzerland )?

I have about 1 day in zurich , but can make it two , and i am very confused as to where to go . If there is any famous chocolate ( or cheese ) factory that gives tours , i would be interested . I would also like to know whether paying a visit to geneva ( for 1 day ) is worth it ? Thanks for any answers :) show more I have about 1 day in zurich , but can make it two , and i am very confused as to where to go .

If there is any famous chocolate ( or cheese ) factory that gives tours , i would be interested .

I would also like to know whether paying a visit to geneva ( for 1 day ) is worth it ?

Thanks for any answers :)
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