Kiki a Ola, or Menehune Ditch, extends 25 miles up the Waimea River. Legend says it was built in one night by menehune (legendary small people) to irrigate taro patches for Waimea residents. Today, you can still see a two-foot high portion of one of the walls.

Prince Kuhio Park is the birthplace and home of Prince Jonah Kalanianaole, known as the "People's Prince" because of his great achievements for the Hawaiian people. You can see the foundation of the home, royal fishpond, shrine where offerings were made and heiau where the Kahuna (priests) meditated and lived.

Alakoko Fishpond was built for a young chief and once covered 40 acres. Unlike most fishponds built along the coast, this one was designed inland on a river. Today, all that remains is a 13- to 30-foot wall that divides the fishpond from the river.

Kaula Laka Heiau, a sacred altar set among the Napali cliffs, was built for Laka, the goddess of hula. It is one of the more dramatic sites on the island with views of the cliffs and ocean. The heiau is still used by hula halau.

Wailua was once home to the island's royalty. The banks of the Wailua River are considered sacred and were once a favorite dwelling place reserved for the kings and high chiefs of Kaua‘i.  Near the mouth of the river in Lydgate State Park are the remains of a heiau that was a place of refuge for those who had broken a kapu (taboo). On the river's north shore are two large pieces of smooth stone, where women of royal blood or high chiefly rank gave birth. Nearby is Holoholoku Heiau, believed to be the oldest on the island. Near the Opaeka‘a Falls overlook is Poliahu Heiau, a large enclosure of black lava rock which had been the personal temple of Kaua‘i's last king, Kaumuali‘i. This is also believed to have been built by the Menehune.