Moai is the dead vertical, blank face. Go straight up the micro-crimps on bullet stone. The holds get better toward the top, but it's not over until you've topped it out.
Park at the teal treatment plant, and follow the trail up about 5 minutes. Wander right through the forest to a pretty big boulder. On the side facing back down toward the treatment house is a 15 foot tall vertical face with a perfectly flat landing. This is Moai, AKA Tall Face.