View of Hanauma Bay from summit of Koko Crater

From Pu'u Ma'i (1,208 ft), the highest point on the rim of Koko Crater, the view southwest extends over Hanauma Bay where the ocean has filled an ancient volcanic crater.

Volcano Climbing, Hawaii: Koko Crater (Kohelepelepe)

The main "trail" up to the summit of Koko Crater follows the course of an old incline railway that was once used to transport military personnel to lookout posts at the summit of the volcano.

Volcano Climbing, Hawaii: Diamond Head

A switchbacking trail, a series of steep concrete steps, a tunnel blasted through rock, and a metal spiral staircase comprise the trail to the top of Lēʻahi ("brow of the tuna"), a volcanic tuff cone better known as Diamond Head. The view westward from the summit, 760 feet above the waves, extends over Kapiolani Park to the towers along Waikiki Beach.