The Pagoda is the western face of two rocks (the other being "The Rock of Ages" to the east) with a narrow alley between them. From the west the Pagoda can be noticed as having a very large face that is about 80' at the leftmost side and spans to a length of about 150' on it's right side. There are four routes on the Pagoda last I was there one of which is an aid route up the shortest side of the rock at the top of the alley between it and Rock of Ages. The other routes are on the western face ranging from 5.7 - 5.10.
From Stage Road (the main fire trail) The Rock of Ages shares its approach with Pulpit and Pagoda Rock. On the left of the trail is a wooden post for Nature Walk 8. Past that on the right is a post for Nature Walk 11, then a bench, then Nature Walk 10. A few feet later, on the left, is the straight, narrow, well-worn dirt trail you want (goes uphill and to the right). Immediately after the trail entrance is a small dried creek. If you hit Nature Walk 9 you've gone too far. If you hit the green gate you've gone even farther.
After a short hike up the trail and over some rocks you'll see Pulpit on the left. It's the first area and it's hard to miss with its one bolted route right next to the approach. Shortly up past Pulpit is Pagoda Rock.