Fairy lights will not be allowed as you need to have electrical items like that checked to have them o site. You will also have very little individual space and will not have time to fiddle around like that.

I am going on a school trip this year, and i want to take something's to decorate the room with. But, they have to not take up much space and have to be pretty, and my friends are REALLY messy, so it will have to be easy to fix and sort out if they break it or something. I was thinking fairy lights?