Hulihee Palace was built in 1838 by the island's governor, John Adams Kuakini. Made of lava rock and coral mortar, the house served as the summer home of Hawaii's ali'i (royal family). You'll see beautiful koa furniture and 19C artifacts on the guided tour. Try to plan your visit during one of their frequent concerts of Hawaiian music and hula, typically held at the palace the last Sunday of the month (call for schedule).