>> Day 1 - Geneva Airport to Montreux
This trip will take less than an hour-and-a-half. If you are arriving early, what do you have planned for the rest of the day?
This page might be useful:
>> Day 2 - Chocolate train from Montreux to Broc (return) - this only appears to get a discount with the Swishers Travel Pass
The Chocolate train is sold as an excursion package, including return first-class train travel, transfers by bus from Gruyères station to the village; and then on to the chocolate factory in Broc after a break of 2.5 hours. Coffee and a chocolate croissant is also provided.
It might be worth enquiring about whether you would get any discount on the rail fare component with the Regional Pass Lake Geneva-Alps, by submitting a query on the following page:
As an alternative, you can take normal trains along the same route, but would use the train for the transfer between Gruyères and Broc instead of the bus. The stop for the cheese factory is Gruyères gare; for the chocolate factory, you get off at Broc-Fabrique. Both stations are on the same train line. You can use the Swiss Timetable to plan your trip:
The whole rail trip would be free with the Regional Pass Lake Geneva-Alps on one of the free travel days. You would have to pay for entry to the cheese and chocolate factories.
>> Day 3 - Montreux to Lausanne and then on to Grandson (return) - not sure if this is included in the Lake Geneva Pass
The Regional Pass Lake Geneva-Alps is valid as far as Yverdon-les-Bains on Lac de Neuchâtel (Lake Neuchâtel). You get free travel to Lausanne (if you use one of the free travel days) and 50% discount from Lausanne to Yverdon-les-Bains. You would need to pay full fare from there to Grandson, which would be CHF 3.70 (train, adult, 2nd class, valid one hour).
>> Day 4 - Montreux to Vevey (return)
What are your plans for the day in Vevey? Strolling along the lakeside promenade is beautiful, and there is a picturesque "old town" area close to the waterfront in Rue du Lac.
Other great things to do include:
Les Pléiades cogwheel train
Funicular railway Vevey-Mont-Pèlerin
A short train trip through the vineyards is also beautiful. I described how to do it in my post of May 19, 2017 - 4:32 AM on the following page, and included some photos:
All of these would be free with the Regional Pass Lake Geneva-Alps if you use one of the free travel days, or 50% off on the other days.