I never thought I would get into anime, but I love Hiyao Miyazaki's work. More than his animation, I love his stories. He is very environmentally conscious, and this seems to make an appearance somehow in all of his work. The message in Princess Mononoke is that humans and the forest must live in harmony.
The movie is long, but it is enthralling. There are three wonderfully strong female characters. San is my favorite. She is a woman who was raised by wolves and who considers herself to be a wolf. She works to protect the forest and the animals from the invasion of humans and their violence.
It is an impressive movie. I highly recommend it.