Trip planning guide according to this thread:
Shit happens, as does vomit- so keep on driving and pick accommodation with 1 loo per 100 children.
If the weather looks grim, it's the perfect day for a geography trip or an outing to the seaside.
The worse the weather or locale gets, the more meaningful the geography data gathered.
Health & Safety and Headcounts are minor concerns- as long as you bring most of them back in one piece. Children are also resilient and do not need things such as spare clothes, warm clothes, waterproofs and weather ready footwear or anything else weather appropriate.
The worse the weather & the facilities, the more character building the trip.
If a child or parent warns you of a medical issue, homesickness or a phobia to watch out for, they're probably lying- ignore them.
The smaller the child, the more important it is to pick a trip that will provide memories to last a life time- deeply scarring ones. The darker the destination the better.
The dump, the local sewage works and the local supermarket are excellent trip locations and kids should be grateful to visit. Ditto power stations if you're REALLY lucky.
If it is an exchange trip, always match pupils with a wildly inappropriate, weird family who serve no edible food and have nothing in common with their guest.
Wine will blot out all the horror on residential. For staff and teenagers.