Diamond Head State Monument

In the 19th century, British sailors mistook crystals in the soil of this extinct volcanic crater for diamonds, thus the now internally known name, Diamond Head. Its Hawaiian name is Leahi. Today, the crater is the most photographed site in the state. To many, it is the symbol of Hawaii. It's also one of Oahu's most popular hikes, and with its paved path and stairs, the 1.6 mile trail is relatively easy. And the views at the top don't disappoint. At the summit, you can see the shoreline of southeastern Oahu from Koko Head to Waianae, and in the winter, you may even be able to see breaching humpback whales in the distance.