Thank you for your helpful advise. I will visit both Zermatt and Bernese Oberland as part of my Swiss alps vacation. As suggested by you I will travel to Zermatt first and then to the BO area. I have made the following itinerary for now :
June 22 - Arrival at Zurich Airport at 6.30 am. Rail transfer to Zermatt (3:12 h). Free time at leisure. Overnight in Zermatt.
June 23 - Mountain excursion to Klein Matterhorn Glacier Paradise. Overnight in Zermatt.
June 24 - Rail transfer to Wengen or Grindelwald (3 hours) where we will make base. Free time at leisure in the afternoon.
June 25 - Excursion to Mt Jungfrau with visit to Kleine Scheidegg.
June 26 - Excursion to Grindelwald First for some adventure activities like zipline experience and Eiger Cliff Walk, poss. leisure hike. Pfingstegg Tooggan.
June 27 - Poss. mountain excursion to Mt Schilthorn, excursion to Lauterbrunnen valley with it's many waterfalls.
June 28 - Poss. excursion to Berne, visit of the old town, the clock tower and the bears. Or perhaps just could Leisure around BO area. Or perhaps could omit this one day and increase a day in Zermatt. June 29 - Rail transfer to Paris.
My concerns for the above are :
1) After reading up on Grindelwald and Wengen, I have come across insight that Wengen is a car free, quiet and smaller village like town while Grindelwald is a bigger town and more busy especially during summer. I am basically looking to enjoy a mountain experience where my parents and children will enjoy. With my above itinerary, could someone provide suggestion on what they think in my case would be better between the two, Wengen or Grindelwald.
2) Do you think 2 nights is enough for Zermatt or perhaps I stay 3 nights in Zermatt and then 4 nights in BO which means that I would not go to Berne. Or any other adjustment suggested for my itinerary.
3) Do you think there will be too much walking / excursions for my parents on this trip and does the train transfer from Zurich to Zermatt and then from Wengen/Grindelwald to Paris involve too much walking or is it short distances enough for them to walk. Or should I consider driving or renting a car from Zurich ?
4) I want to include Cheese / Chocolate / Farm activity but could not find anything yet in the BO area.
Thank you and to everyone else for the assistance and am grateful to have this forum available for insights on planning on the trip.