Upriver from Schist camp.
Crystal Rapid from the high scout. Crystal is one of the two most famous rapids in Grand Canyon, though a good run is quick and uneventful. Bad runs can be anywhere from a little more exciting to downright terrifying. During the high flows of 1983 Crystal transformed into a monster that could, and did, thoroughly dismantle motor rigs and oar boats alike that went into its deep, dark hole of despair.
The rock garden. Don't go there no matter how bad Crystal wants you to. On the plus side, if you do you might win a free helicopter ride to shore...