Diamond Head looms large over the Waikiki. Actually named Le'ahi by Hawaiians, it received its more well known name in the late 1700's when British seamen saw calcite crystals sparkling in the sunshine and thought they had found diamonds.
A hike to the top of Diamond Head takes about an hour over a well-worn path. The trail up, for the most part, is not too difficult. There are handrails along the entire 1.4-mile round-trip journey. There are also benches to sit on if you want a break. Some people actually run the trail "for fun."
The summit offers a spectacular 365-degree view of Oahu and is a must trip for photography enthusiasts.