Zurich--> Dusseldorf. what to do in between? Hiking?

Hello all! I am going from Zurich to Dusseldorf in two weeks to see some live music. I am arriving Zurich May 17 and need to be in Dusseldorf by late afternoon May 19. I have trains etc. all figured out, but was wondering if anyone had good ides, esp. those that involve a day of Swiss hiking, for the 18th? Thanks for all the help!

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