OK, now for some jumping off questions:
What did you feel was the main intent of this book? The author's overall message/feeling to convey? Did you agree with/disagree with/not comprehend that intent?
What cultural biases do you think influenced the book?
What was your favorite part of the book? Least favorite?
If you were the author of this book what one thing (or multiple things) would you change?
With this particular book the writing style is very distinct. Momaday captures every portion in a picture, a fact, a myth, and a personal experience. Which of the method did you respond most to? Which did you respond least to?
Is there any particular background information you wish you'd had before starting the book?
Now remember these are just starting points! Have fun with it!