I suggest Grindelwald as being one place where you can in a 360 degree view see so many awesome ice-girdled peaks as well as a very wide amphitheatre or a valley miles in circumference - can see tiny toylike trains plying the hills - a panoply of aerial cable cars

And if you want to experience higher altitudes then hop the aerial cabel car from Grindelwald to Mannlichen - then do the fabled few-mile flat and easy ridge walk to Kleine Scheidegg - with awesome views over both the Grindelwald and Lauterbrunnen valleys and of the Jungfrau - the majestic iconic jagged peak dominating the Jungfrau Region for miles around.

Mannlichen itself if very famous for its splendorous views - often called the best vista if the whole area - of both valleys and eagle eyed down over Interlaken itself, bookended between its two lakes.

For variety from Kl Schiedegg take the train down to Wengen - perhaps putz around this famous quiet car-less Alpine village with views to die for and then return to Interlaken by train via Lauterbrunnen.

That scenario would let you see and experience both the Grindelwald and Lauterbrunnen valleys - in quick day but you have so little time - I DO guarantee that this would be an absolute highlight of your trip that will stick in your mind forever!

Thanks again.
1. "...then do the fabled few-mile flat and easy ridge walk to Kleine Scheidegg - with awesome views over both the Grindelwald and Lauterbrunnen valleys and of the Jungfrau - the majestic iconic jagged peak dominating the Jungfrau Region for miles around."
We have very little resistance to walking. Will there be an alternative and be able to appreciate the beauty of the landscape on the way back?
2. I'm confused between the Swiss card and the eurail pass. Will it be wise for me to get a two country pass, since we are travelling into Germany as well? I understand that the Swiss card is good for a family with kids <16 yr old. My son is 14. I checked out the web sites, there are only descriptions of the passes, but to order, there is no straightforward item for the swiss card or saver pass etc.. Each ticket is per adult.

Swiss Pass is free for anyone under 16 traveling with a parent - must be a parent, not a grandparent, etc - called the Family Pass and kid never pays a dime, even on things that Swiss Pass only discount - Swiss Card is a different creature - I would if you strongly look at the 4-consecutive-day Swiss Pass that would cover virtually all your transportation from city trams and buses to trains and give 50% of aerial cableways like from Mannlichen.

I would certainly think a Swiss Pass and then online discount tickets for the Germany portion would be best - with a Eurail Pass many trains in Switzerland will not be covered - like to Grindelwald from Interlaken (25% off only not 100% like Swiss Pass and there is no free pass for kids - he would have to pay full adult pass price on a Saver Pass - so IMO forget any Eurailpass.

Has anyone used DIRECTROOMS.COM? for your hotel reservations? Has anyone heard anything about it?