Wilderness (2006)

After a kid kills himself, the rest of his dorm at the youth correction facility are sent to a deserted island for an outward bound weekend as a punishment for not helping the kid. Once there they find they are not alone as they bump into a group of women from a similar correctional facility. Also on the island is the father of the suicide boy who intends killing them all one-by-one because of what happened to his son. So it's pretty much modern-British-horror-thriller-by-numbers. It even has Sean Pertwee in it. Watchable, mildly diverting but ultimately forgettable.