In reply to lowersharpnose:
What if you demonstrate that it is not a holiday? I (and others on a course I taught) took 30 trainee teachers, their mentors and 140 Primary age children to Anglesey for 2 weeks a couple of years ago. The trip was a component of a teacher training programme, sponsored by 3 local authorities. The 'camp' comprised a structured day, in which the students used the outdoor environment to explore (with the school-kids) elements of the KS2 national curriculum in English, History, Science and Technology. Everyone was provided with a homework 'task', and the students as well as the children maintained a diary and folder of their inputs etc.
I asked my lad's localPrimary school (not one involved in the camp) whether he could come. I explained the programme, and showed the head the workbooks etc and how it would support (even amplify) what he was doing at the time. A flat refusal, and even then a threat of some action or other.
In the end I took him, regardless. He had a great time, mixed with youngsters from a range of backgrounds, saw the value of learning about the world around him, experienced the outdoors etc.
Even now I think I'd be prepared to do a stretch inside for what he got out of it.
I realise there are abuses.But some youngsters learn far more on their holidays than in (some) schools where (some of ) the teachers are time-serving, rule-governed and risk-averse.