Klook.com offers an 8% discount on most activities in Europe, and in some cases even a 20% discount. Use the promo code "EUBLACK21" until 2 December 2021.
Details can be found here: https://www.klook.com/tetris/promo/klook-black-friday-sale/
Specifically for Switzerland they currently offer tours to Jungfraujoch and Mount Titlis: https://www.klook.com/coureg/44-switzerland-things-to-do/
web browser that
supports HTML5 video
All you need to know about traveling by train, bus or car in Switzerland.
Hand picked Swiss hotels and other accommodations are right here.