great experience! its a easy hike (1 to 2 hours) to the top of the crater, where you get the chance to see an amazing view of waikiki/honolulu. There's a entrance fee of 5$ per car, or 1$ per person, diamond head can be reach easily with TheBus (truly the best bus transportation system I have experienced). Bathroom are available at the beginning of the hike, same for vending machine. Personal tip: the park opens around 6am, get there early to have a less crowded experience and a better view
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