What is this movie?

So, i saw this movie years ago but have no idea of the name. The big scene i remember is this group of teens go camping and they are on a raft or canoe or something of the such. they're all kinda picking on one of the kids and that kid ends up getting pushed into the water but he hits his head on a rock and dies. They freak out go ashore and set up camp to figure out what to do. Any ideas??