Diamond Head & Oahu Coast Half-Day Tour. Experience spectacular views of Oahu on this 4-hour guided tour. While traveling by air-conditioned coach, you’ll have the chance to stop and look out at notable sites such as the Koko Head Crater, Hanauama Bay and the majestic Diamond Head. Your guide will provide expert narration as you go, deepening your understanding of this beautiful island. Hotel pickup and drop-off are included on this half-day adventure. Book this Tour and Save 20% Off Diamond Head & Oahu Coast Half-Day Tour.