Yes of course there's going to be more ice cream and puddings and treats etc but I think that actual meals should still be vaguely healthy?
Ds4 has chosen some terrible 100% sugar cereal as a treat for breakfast and I've just got out of the shower to find that Dh has deemed it acceptable for our 20m old to basically pick the marshmallows out of his brothers cereal and eat them for breakfast. And it's ok because we're on holiday.
I may be slightly biased because Dh is rubbish with their food when we're at home as well, doesn't give a thought to balanced meals, fruit, veg etc that's all down to me, but surely even on holiday on holiday marshmallows for breakfast for an under 2 is a bit much?!