Jun 16, 2016 - 5:45 AM
Hi Prakassh, welcome to MySwissAlps!
Are you coming from Düsseldorf on your way into Switzerland as well? The reason I ask is that it seems like you plan to take a flight. A train ride might be your better option. Trains take the more direct route without a detour through Zurich, and the quickest trains take about the same time as a flight if you include the time to get to/from the airport, luggage collection, etc. There's even a direct train from Düsseldorf to Interlaken. The more enjoyable and eco-friendly option I would say. Tickets are very cheap at the moment: from only € 34 through www.bahn.com. More options are here. Booking early is recommended.
a) You'll find lots of suggestions through the below links. Be sure to include a few hikes/walks; that's the best way to see the Alps.
b) It depends on your mode of travel and route on your way in or out. If you pick the train option I explained about, the transfer to Interlaken is included in the ticket from Düsseldorf, so a 4-day pass will work. If you prefer a flight, you will need an additional ticket (or pass day) from Zurich to Interlaken. There are two passes to consider I would say:
Both passes can be printed online to save time on arrival: you can visit www.swissrailways.com/ en. After filling out your address, they will show the delivery options. Pick "Online Ticket" from the bottom of the list. They will e-mail the pass (no delivery fees), so you can print it at home. Be sure to order today or tomorrow morning, or they may not be able to issue a pass for the 22nd (it takes a few business days to process orders).
I hope this was useful!