Jul 11, 2016 - 2:48 PM
Hi ua1234, welcome to MySwissAlps!
1. The pass you need is the Swiss Travel Pass. A Swiss Pass is something different. The 8-day version would work fine, but it looks like you can do with a 4-day pass from July 17 to 20. You'll only be in Geneva on July 16, and public transport there is free if you book a hotel there. You may not need any transport at all if you book a hotel close to the train station. You can buy a ticket from Interlaken to Milan for July 21 through any of the websites listed here.
I'd recommend to buy that ticket to Milan asap as it's high season and some trains may book out. Also I'd recommend to order your Swiss Travel Pass no later than the 13th so you have time for it to be e-mailed to you. You can print it at home and save yourself some time by skipping the ticket office in Geneva. All options are here.
2. I'd suggest to just take the quickest route since you won't have a pass that day. Apart from that there are no alternative routes that take less than 6 hours. Well, perhaps there's one option: you'd normally travel via a long tunnel between Spiez and Brig. Instead, you can take a local train from Spiez via Kandersteg to Brig. That's for sure more scenic. If you choose this option, then don't buy a ticket Interlaken - Milan, but only Brig - Milan. Additionally buy a ticket Interlaken - Brig via Kandersteg from the train station in Interlaken.
3. Rain does not stop the trains, no worries. Please see the map for what's included in the pass.
Last modified on Jul 11, 2016 - 2:54 PM by Arno