The hike to the top of Diamond Head is hot, rather steep, and has numerous switchbacks. From the trail head to the summit of the crater the distance is .8 miles or 1.3 kilometers with 560 feet or 171 meters elevation gain.
There are two sets of steep stairways on the trail, with 74 and 99 concrete steps. On your way you also pass through a lighted tunnel, 225 feet long. There are bunkers on the summit of the crater, built in the beginning of the 20th century.
This was an ideal location for coastal protection of the island of Oahu. Diamond Head is National Natural Landmark, and is one of the best known places in Hawaii.