Pu'uhonua O Hōnaunau National Historical Park

"Catch a glimpse of what Hawaii looked like before European contact. An unmissable destination for culture buffs, this sacred area stretches along the lava flats of the Big Island's western coast. Behind a massive wall stands an ancient pu'uhonua (place of refuge)—where defeated enemies and those who violated the kapu (laws) could seek pardon. The park also shelters the Royal Grounds, a residential and ceremonial epicenter, and the 1871 Trail that takes in the shoreline. Tip: This is a religious site, so be respectful and don't smoke, picnic, play sports, take wedding photos, or carry beach equipment (including towels) here. Just north of the boat launch outside of the park you can find Two Step, a phenomenal scuba and snorkeling spot."