Jun 13, 2019 - 7:27 PM
We did a 9 day trip last October, and here are a few things we found, many of which have been mentioned in various forums on this website. Swiss Travel Pass is invaluable, especially for last minute changes to anticipated itineraries or impromptu side trips. Likewise, the Traveler's WiFi is great and works almost everywhere. Download the SBB rail/bus/boat timetable to your smartphone, iPad, etc. Boat rides on the various lakes are often a relaxing way to spend part of a day, stopping in towns along the way for lunch or sightseeing.
For mountain trips, be sure to check the live weather cams to see what the weather is on top before you leave. We left cloudy & drizzly weather in Lucerne for beautiful sunshine on Mt. Pilatus based on the live cameras, and had a great time. Have 1 & 2 Swiss franc coins on hand for WC visits; my wife especially approved of this idea after the first day. We got about $400US of Swiss francs at the beginning of the trip, and at our spending rate that lasted the entire trip. Mostly the cash was for small purchases, we used credit cards for hotels and dinners.
Since we were there in early October, we took hiking boots, sweater, and rain jacket; didn't need any of those since we had great weather. Since you're going very soon, you can probably skip the heavier clothing part but be aware the weather on the mountain tops can be quite a bit cooler and windier than down in the valleys; a rain jacket/shell would be a good idea.
Hope you have a great trip!