My wife and I usually have gone as a couple after our kids were grown. When we've had guests, it has certainly added to the stress and pressure a bit, but was also greatly fun and rewarding. Nothing keeps one's appreciation fresh as sharing it with others.
I advise not to make a lot of advance promises on itinerary details - don't accept a mindset that you are now obligated to tick off every item on the collective itinerary.
I will confess that we actually have paid the advance boatyball reservation fee in this situation, just to provide maximal flexibility.
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