We are visiting Switzerland from 5th to 18th August and we are planning to take a Swiss pass. We would be arriving at Zurich airport and would be staying in Wengen which is our first halt, then we are off to Zermatt, then to St. Moritz and then to brunnen. My question is as follows.
Since it is the season time is it advisable to take a Swiss pass for first class specially since we will take Glacier express which could be crowded.
Secondly do you have first class for all the trains including the one form Interlaken to Lauterbrunnen then from Lauterbrunnen to Wengen.
Thirdly is it possible to selectively upgrade a particular sector if required.
Finally is it worth visiting Glacier 3000 near Gstaad considering we are in Wengen for 5 nights.
Thanks in advance for your help.