OK, our school has asked us where to go for the end of this term as a treat, but the condition is that it has to be suitable for 12 people, for both boys and girls, and for the age range of 13-14 years old (slightly older is fine). So it can be anywhere and anything (in fact it can be abroad, like our head teach first thought of - but that means we have to pay as well), so any ideas?

PS, it can be slightly over £30, but it has to be affordable for people's parents.