Located at Napo'opo'o Beach (Kealakekua Bay), the Hikiau Heiau is an ancient Hawaiian temple site that was built by King Kalani'opu'u. It is a luakini (human sacrifice) heiau.
The original heiau used to be more than 250 feet (76 m) long and 100 feet (30 m) wide. A smaller stone platform is built on top of the main platform and is believed to have been the location of the lele (altar).

In middle photo background is where we would be snorkeling by Captain Cook Monument.