There's an increasing thread running through this site of 'different = bad'. When did our society become this myopic - or has it always been that way and I just didn't notice?
Go AI and you can still get out and about, mix with the locals, go sightseeing and exploring and immerse yourself in the local culture. No one has to lie about on a plastic sunlounger or fight for an umbrella on the beach everyday unless they want to (and although it's not for me, as a complete retreat from stress in this way I 'get' the appeal).
For next year I've planned a long road trip around the Glacier and Yellowstone National Parks. Fun - and absolutely my 'thing' - but labour intensive. You could call cruising 'AI' and I've done enough of those - low maintenance and you get to see as many places as possible on one holiday from the comfort and luxury of a ship. Sometimes I CBA to sit on planning tools for hours and want someone to do the hard work for me. Why are these things viewed so rigidly? And if people want different things from their holidays than we do from ours, why do people care?
As for taking DC out of school, I've done it precisely once (and for a day only). But I told the teachers straight up it was for a holiday, and after an intensely stressful period DH and I had decided the family needed it. They were fine, and very supportive.
And here, OP has a point. Own your decisions. This is not one I habitually make, and as to whether the circumstances are exceptional or otherwise, that is for me to judge. I am not asking for the school's 'permission'. I'm informing them, as a courtesy, of our decision. We are still the parents.