Postscript
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And, so, another odyssey comes to an end. After all the planning that went into this one, we were very pleased it unfolded almost exactly as we envisioned. Next time, though, if we're off to Europe again, maybe we would choose a single, escorted tour --- preparations for a trip like that would certainly take less time. Alternatively, a shared adventure in the USA might be simpler and easier to arrange. There's much worthwhile to see and do in our country and it is much closer at hand.
It was a great experience sharing the stay in Switzerland and the Rhine cruise with our State College friends. Truly, they have earned the title "World Travelers." Jan has created his own Google Photos album of the weekend he and Diane spent together in Amsterdam. For anyone curious about that city or how they experienced it, the link can be found here:
Jan's Amsterdam Album
The "next trip" is being kept secret as, for now, none of us knows where it will be. Wherever it is, a repeat of times like these will always be welcome: