DD is currently on a school trip today. It's actually a whole school trip which they do once a year (its a small school.) And the destination is a mystery beforehand. The teachers know where it is to, but the children don't - and neither do the parents.
We were told they needed a packed lunch, £2 for ice cream if they wanted to, waterproof shoes (but not wellies) and a waterproof coat (the last two due to the weather forecast!) This year we were told it was about an hour's coach ride away - in the past it has been up to 2 hours away.
We then get a text once they have set off to tell us where they are.
This was introduced 4 or 5 years ago at DD's school and they love it. There is always so much excitement about where they are going. They only find out when they arrive - seems most of the journey is spend excitedly trying to guess where it is, looking at sign posts to help them. Never had this when I was growing up but sounds fun.
Does your school do this?