How is this 7 day itinerary for a variety of sightseeing? September.

We stayed 5 nights in Wengen in late June 2023. I would not plan any specific thing on a certain day. Stay flexible due to weather. We had some rain 5 days of 6, and this is more likely in September. Prioritize what you want to do. Watch the weather and webcams closely. If Jungfraujoch is priority 1, go the very first clear day and go EARLY.

All the other hikes you can just see what the weather is like every morning and go where the weather is best. But be prepared for very sudden weather changes.

We loved the views of both the valley and mountains from Wengen. We were in an apartment, so we didn’t eat breakfast at a hotel. I rarely find it of value in Europe, especially at that price and when there are great bakeries & cafes around. Even the grocery store in Wengen has great breakfast options. I would not prepay for breakfast. Maybe try it one day and decide if it’s worth it.

Good point about the weather. Will try and pick biggest priorities for good weather days. Partly why I’m not planning Zermatt since I don’t wanna head all the way out there and have bad weather show up.

I think it's okay to skip Rigi since you have lots of alpine activities already. Do Schilthorn instead and give yourself that full buffer day on Day 5 without leaving. You'll need it for weather. Alternatively, you could skip Luzern and just do Wengen the full time, as there are plenty of lake activities to do around Lake Thun & Lake Brienz and the Schynige Platte/Oberberghorn/Daube trail is just as good as the Stoos but less crowded. This would gain you back a day and honestly I think it's a better option.

If you want to keep Luzern -
Day 1 - arrive in Zurich airport around 8am, train into Wengen, store luggage and do Mannlichen to Kleine Scheidegg in the afternoon
Day 2 - Wengen > Lauterbrunnen > Grutschalp > Murren > Schilthorn > optional Birg > Murren > Allmendhubel > Northface hike counterclockwise > Murren > Gimmelwald > Stechelberg > Lauterbrunnen > Wengen
Day 3 - Day trip to Oeschinensee (this is a long day trip and I would not plan to combine Blausee, Kandersteg & Spiez into it. If you really want to do Oeschinensee, commit the whole day to it. And if it's not sunny, don't waste your time going all the way there, as it won't look like the photos you've seen)
Day 4 - Schynige Platte
Day 5 - Buffer day for all the activities above
Day 6, AM train to Luzern, hang around lake, explore old town
Day 7, Stoos ridge hike

If you want to just do Wengen -
Day 1 - arrive in Zurich airport around 8am, train into Wengen, store luggage and explore Wengen
Day 2 - Mannlichen to Kleine Scheidegg hike + optional Jungfraujoch
Day 2 - Wengen > Lauterbrunnen > Grutschalp > Murren > Schilthorn > optional Birg > Murren > Allmendhubel > Northface hike counterclockwise > Murren > Gimmelwald > Stechelberg > Lauterbrunnen > Wengen
Day 3 - Lake day (Lake Thun with castle stops at Spiez, Oberhofen + Thun OR Lake Brienz with beach stop at Iseltwald, Giessbach Falls, Brienz, etc.)
Day 4 - Schynige Platte Oberberghorn/Daube ridge trail
Day 5 - Day 3 - Day trip to Oeschinensee (this is a long day trip and I would not plan to combine Blausee, Kandersteg & Spiez into it. If you really want to do Oeschinensee, commit the whole day to it. And if it's not sunny, don't waste your time going all the way there, as it won't look like the photos you've seen)
Day 6 - Ebike the Lauterbrunnen Valley or Grindelwald First or another lake day. Plenty of options.
Day 7 - Buffer day for everything above, as you very likely won't have 7 straight days of perfect weather

Super helpful thank you, is Lake Oeschinensee something where the hike is crucial to do? It looked a little strenuous and we thought we would save a little time and cable car up to have more time that day for other stuff, but if it makes more sense could also do the actual hike and spend more time there