"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
I don't know how it will be, but it's pretty bad. It's nothing i've ever been through before, I didn't feel a tear or a pop. I'll wake up and see how it feels tomorrow.