Terrible.
This movie is much more horrific and dark than the plot synopsis would lead you to believe.
The wilderness first aid in the movie is inaccurate but I was able to look past it. Lay down on a skull fracture on the pack of your head? Ouch.
The whitewater depiction, however, is incredibly inaccurate and unrealistic. For instance, one of the characters is paddling a kayak with no spray skirt, then magically has a spray skirt on in the next scene. Also, they pop a hole in the boat and then it magically patches and reinflates itself.
As a rafter and kayaker... I think the moral of the story is never have a one boat trip and this is what happens when you don't tip your guide. 🤷