Ahu Riata is located on the outskirts of Hanga Roa and can be easily combined with a hike to Orongo. The Ahu Riata has been restored and is located next to the small Hanga Piko Harbor. On the Ahu Riata is a single moai. A little further up on the meadow in front of the Ahu, there is another Moai laying on its back in the grass.
The Ahu is despite its location close to the city, much less visited than Tahai, which is located at the other end of the city. This gives you the opportunity to take your photos without anyone disturbing you. Even at night, this Moai is looking great. A little light from all around was enough to make the Moai appear bright in the long time exposure, while it was still dark enough so that you can see the stars behind. You can see a pic of that on the stargazing page.