Thanks to Arno and Annika and other fellow travellers who have contributed ideas, I have done an itinerary for 10 days (from 12 Jun to 22 Jun) . However, I have some questions and would appreciate any comments/suggestions.
Day 1: Arrive in Zurich around 8am. Travel by train to Interlaken OST via Golden Pass scenic route (longer train ride via Lucerne instead of Bern. Planning to take 1410hrs Lake Thun cruise. Stay in Wengen.
Day 2: Wengen - Mannlichen cable car - hike to Klein Scheidegg. If weather permits, will ascend to Jungfrauhoch. If weather is not good, I need alternative plans. Stay in Wengen
Day 3: Schyanige Platte - Lauterbrunnen - Grutschalp - Murren. Stay in Wengen
Day 4: Lake Brienz - Brienzer Rothorn - Schilthorn. Stay in Wengen
Day 5: Harder Kulm in the morning. Train from Wengen to Zermatt. Plan to arrive in Zermatt around 2 pm. Go up Gornegrat Bahn to see Matterhorn. Stay in Zermatt
Day 6: Take the Matterhorn Express. Stay in Zermatt
Day 7: Regional train to Celerina (nearly whole day travelling on train). Stay in Celerina.
Day 8: Diavolezza & Poschiavo. Stay in Celerina.
Day 9: Alp Languard & Muottas Muragl. Stay in Celerina
Day 10: Train to Lucerne. Boat ride on Lake Lucerne followed up a trip up Mt Rigi. Travel back to Zurich to stay a night.
Day 11: Depart Zurich in the morning.
I have a few questions:
Day 2 - if the weather is not good to ascend Jungfrau, what options do I have from Klein Scheidegg? Do I go down to Grindelwald and what is there to do? My interest is in sight-seeing and easy hiking (not too difficult as I have 8 & 10-year olds with me)? I read about a cable car to First from Grindelwald but am not sure.
Day 3 & Day 4 - Assuming the weather is fine, is it possible to do the Schilthorn on Day 3 instead of Day 4? Would it be too much? For Day 4, will there be time after I finish the Lake Brienz and Brienzer Rothorn to do something else that is not too out of the way for a couple of hours ?
Day 6 - If i have gone the Gornegrat Bahn on Day 5, any suggestion of what I could do on Day 6 in Zermatt? Any easy hikes?
Would appreciate any other comments on how I could fine-tune my itinerary!