My family recently returned from a six week vacation in Europe that included 4 nights in the Berner Oberland.
We stayed in Wengen, which I would recommend as a base to stay - does not seem to be covered much in Rick's book.
I have three children and we wanted to visit both Schilthorn and Jungfraujoch, both of which are pretty pricey. Rick does cover the Junior Card in his book, but I wanted to better emphasize what a great deal it is. The Junior Card is only 30 SF for the first child and another 30 SF for my other two, so 60 SF in total for my three. They get to then travel for free on the trains, which is a big money saver, but the cards are also honored on both the Schilthornbahn and Jungfraubahn!!! We did have a Eurail pass, but I believe we saved about 300 SF by having the Junior Card which meant the kids were free for both these expensive trips.
Wanted to highlight this pass in case you miss it in Rick's book, it can really make some of those expensive trips much more affordable for families.
BTW, both the Schilthorn and Junfraujoch were amazing and both must-do trips IMHO. Check the forecasts carefully and the webcams on the morning.
Hope that helps.