As already mentioned the bamboo might work as a knife for some tasks. I might waste many hours trying to create a fire piston out of it, and I might even succeed, but the fire plow seems more likely.

hmmm knife from a non native lifeform in the canyonlands... is there a turtle or some shelled something there? Some bones of an introduced mammal? Some invasive plant? Pull one of my teeth and sharpen it? So many choices...

I can not top the tylonel surprise solution.