All very good tips, one personal suggestion: don't fall in to the Jungfraujoch trap (218chf p.p. to be on a train than runs half of its time in a tunnel) , if you really want to do some sightseeing take a chopper flight around the Matterhorn ( 260chf p.p. 20 minutes flight, apero and lunch).
If you are in to driving, ride the mountain passes around the Gotthard: Furka, Grimsel, Sustenances, Oberalp, Gotthard and Lukmanier, with tuns of options for stopping to do some serious hiking.
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