Difficult for you, if the parents are happy with it, so I wouldn't intervene, as it's unlikely to change anything, and will just cause friction. Personally, I would not be happy with a child of mine of that age going so far afield on a school trip. However well-intentioned and responsible the accompanying adults are, the ratio of them to the number of children means that they could not possibly provide the one to one supervision that a parent can. I'm also surprised, as recorded on this thread, that anyone thinks that it's safe to allow a 9 year old to walk to school unaccompanied. Not in my world, and I say that regardless of the environment in which that journey takes place. Encouraging children to stretch their wings is fine, but exposing them, unsupervised, to an environment in which those wings could so easily be clipped, or worse, is most definitely not. Some may feel that for a particular child in a particular environment, 9 may well be a safe age, but why take the risk for the sake of an extra year or so? Returning to the OP, there are plenty of opportunities for exciting school trips in the UK for children of that age, with the added attraction that they are obviously more affordable for parents. Times are hard, and money is in short supply for some. Finally, please excuse my cynicism, but I do also sometimes wonder if some of these more exotic trips aren't more for the benefit of the teachers. Get those kids to bed.. game on for the grown-ups? No thanks. Not for a child of mine at that age.