Next summer we (me + husband + 18 y.o. child) will spend 13 days in/near the Alps as part of a longer trip (after that we will fly to Naples and continue our trip from there).
Part of the trip is set: we'll stay in Interlaken for 5 days, and use it as a base for day-trips to the Jungfraujoch, Schiltorn and other areas on the Lauterbrunnen valley, full-day trip to Zermatt (leaving early and coming back late), scenic Golden Pass rail. For this part of the trip, we intend to pick a good hotel near Interlaken train station and use railways/funiculars/gondolas to get around. Is this a good plan? How busy is Interlaken on summer, and is it likely that prices will be no more expensive than on winter ski season?
The other part will be a 8-day road trip (we don't mind hopping from hotel to hotel during this period), and I'm lost about how to plan it out, so though I've time I'd still like some input early on. We want to drive between Chamonix to Cortina d'Ampezzo and back to Zurich cutting through Swizterland, Italy, Austria and Liechtenstein.
We've seen several pictures of impressive road mountains that go well above the tree lines among glacial lakes and tundra, and we want to drive in some of them (Grimsel Pass, Susten Pass, Abula Pass, Timmseljoch, Passo Stelvio). Mt. Blanc, Vaduz and Bolzano must be part of the itinerary. However, we're having a hard time trying to pin-point a coherent itinerary. We don't want just to drive on highways, but we also don't want to overburden ourselves with too many mountain road harpins. To make it more challenging, Switzerland has sketchy Google Street View coverage, which helps us a lot on planning for Italy. What would be a good approach or general itinerary for this road trip?