The Trail starts at the Grotto Lake parking lot and then parallels the 1A highway behind the Baymag plant. It is 1.1kms from the parking lot to the dry creek bed where you head north up the creek bed to the falls. The Hopi indian pictographs are just before the falls. From the falls you can continue further up the creek bed through a high walled corridor which eventually opens into a wide open valley. There are some hoodoos in here with a large cave at about the 3km mark.
Visit this site for complete hike description: Outdoor Escapade – Grotto