Travel from munich to the alps for 6 days

Hello. My husband and I will be in Munich on business and will travel to the Alps afterward for 6 days, departing for home from a Swiss airport. Aside from visiting Zermatt (my husband wants to show me this area), our time is open. What is the best way to use our little time well, ultimately ending up in the best Swiss city for departure? I have been researching the entire Interlaken area and am having difficulty making choices as it all sounds wonderful. We'd like to mix hiking, trains and lovely, quaint Swiss gemutlichkeit for an optimal experience. Suggestions from those of you who are more familiar with the area? Your help is greatly appreciated.

We have decided to add a day to do the Glacier Express. Here is our itinerary.
9-19 -- Munich to St. Moritz (overnight St. Moritz)
9-20 -- Glacier Express to Zermatt (overnight in Zermatt)
9-21 -- Zermatt and environs (overnight in Zermatt)
9-22 -- Zermatt to Interlaken and Interlaken sightseeing (overnight in Interlaken)
9-23 -- Interlaken and environs (overnight in Interlaken, Wengen, Grindelwald?????)
9-24 -- Interlaken and environs (overnight in Interlaken, Wengen, Grindelwald????)
9-25 -- Train to Lucerne for day (overnight in Lucerne)
9-26 -- Train to Zurich airport -- depart to USA

Questions: what passes should we buy? 2 of the 2 for 1 Swiss Saver? How do we then pay for the Glacier Express? Also, which places should we stay in Bernese Oberland and Zermatt? Any suggestions from personal experience?

Thanks so much.
Maryb