My 4DDs have all had fantastic experiences in school residential trips. I have always thanked the teachers when picking them up.
Now that my DDS range from 15 to 21 and don't need DH or I there in evenings or mornings I pay it forward by leading a very popular overseas trip (that has been mentioned by PPs earlier in the thread) age group is 12/13.
By god the work that's involved 
. I am already working on 2020 when this year's trip is still to take place. The antithesis of an holiday I've been on.
I have dealt with projectile vomiting, first periods, bad periods, travel sickness, home sickness and all the predictable issues that one would expect to take place. A jolly? Really?
I get emails months in advance about who can't possibly share dorms with whom , and as soon as I think I have cracked the puzzle that is rooming there will be another email.
I give up a weekend and 4 evenings of my own at a time of year where I could have lots of tutoring work and my own DDs could benefit from my professional knowledge.
With crap exchange rates and expensive service stations I will spend a small fortune on coffees etc that I wouldn't have spent at home. Out of pocket but hey maybe I should be for the privilege of being in your precious angel's company?
Yet I will continue to do the trip as long as pupils want to go on it as they learn so much, not just academic- many have never made up a bed or a packed lunch, had to share a bedroom or pack a case. And they have a great time.
The restaurants we go to for dinner put wine on the table enough for a small glass each. I might have one sometimes I don't .
The accommodation has a teachers and guides sitting room where we can lounge. If we're not playing pool, football, admiring purchases, sorting wee squabbles, supervising medication , tracking down lost stuff etc. Point is - rare that many of us are in it for long. It has an honesty fridge stocked with soft drinks and tiny 25cl beers. If it's a clammy night and I'm thirsty I might have one or two . As may a colleague. We are not hiding out in a bar and we man the room when all the above is taking place so that the pupils can always see one of us - door always open.
So I suppose a pupil might see the wine or the beer. They equally might see a jug of water , Fanta lemon or Diet Coke - what do you think they notice? In the same way that seeing Mrs Lidl in skinny jeans and converse is odd or my colourful pjs when they knock my door (again) for whatever query.
I am not licensed to drive a 50 seater coach so would be not be putting anyone at risk. I would be completely able to escort a child to hospital or any other emergency that might arise after a small wine or less than half a pint of beer.
Oh and I might even listen to an audio book on the bus but I really should be listening for every cheap 