I'm taking a group of four men over 25 to Mürren for six nights from June 2-8. We'll all arrive in Zurich and travel to Mürren by train. From there, our itinerary will be entirely focused on the local region.
Mürren Day 1 - June 3 - Train travel to Interlaken, ferry across Brienz to Geissbache, hike back to Interlaken, train back to Mürren
Mürren Day 2 - June 4 - Train/Cable to Kleine Scheidegg, hike back Trümmelbach Falls and Lauterbrunnen, Cable car back to Mürren
Mürren Day 3 - June 5 - Cable to Schilthorn, Cable back to Birg, Hike Back to Mürren
Mürren Day 4 - June 6 - Cable / Walk / Bus / Cable to Wengen, hike to Eiger Glacier, (or reverse), then back to Mürren
Mürren Day 5 - June 7 - Mountain Biking in Lauterbrunnen, Wengen, Mürren area, with likely cable trips needed.
Mürren Day 6 - June 8 - Mürren to Zurich for return flights to US.
Considering the train fare from/to Zurich <-> Mürren, and the local regional trips, especially with a flexible, weather-dependent, mostly hiking itinerary, I'm puzzled at which rail pass options, if any, to purchase. We also need the flexibility to use cable cars and trains to get to/from hiking destinations with some flexibility based on fatigue and goals.
Questions:
1. If the four travelers were to purchase a Half Fare card, would those halve the fare on ALL the above train travel?
2. Does the Bener Overland Pass make sense, given our itinerary?
3. What is the best option for balancing economics and flexibility.