Hello!
I'm traveling to Switzerland in a few days and am debating on getting a STP and which pass I should get and for how many days. If I get the STP for 3 days do i have to use them consecutively? One of the days in Lucerne will be spent walking around and exploring instead of on a train, etc. Here is my itinerary for my trip:
Sunday – Start in Geneva, head to Terrasses Viticoles de Lavaux (vineyards) in Cully 
-   Travel from Cully to Montreaux (Stay in Montreaux 2 nights)
Monday 
-   Chateau de Chillon – Medieval Castle – free entrance with STP
-   Montreaux Lakeside – Walk along the lake – free
-   La Maison Du Gruyere Gruyere Cheese (1 hour and 15 minutes from Montreaux) – free with STP
-   Gruyeres Castle – free entrance with STP
-   Maison Cailler Swiss Chocolate (36 minutes from La Maison Du Gruyere) – free with STP
2 hours to get back to Montreaux 
Tuesday - Montreaux > Interlaken; Interlaken > Wengen (3 hours and 20 min)
Interlaken: St. Beatus Caves
Interlaken > Wengen (Check-in to hotel)
Wengen > Schilthorn (Around 2 hours travel time to get there) On way down can see Trummelbach Falls
Wednesday
-   Top of Europe – Jungfraujoch
-   Eiger Trail
-   Lauterbrunnen 
Thursday – Wengen > Lucerne 
-   Wander the Old Town
-   Lake Lucerne
-   Lion of Lucerne
-   Walk across the chapel bridge (Kapellbrucke)
Friday - Lucerne > Pilatus
-   Mt. Pilatus 
-   Toboggan ride in Frakmuntegg
-   Hiking to Tomlishorn
Saturday – Lucerne > Zurich
-   Leave – purchased train tickets for this day
Any help is greatly appreciated!