This dormant volcano crater is one of Honolulu’s major natural landmarks, known for its history, amazing hikes, and stunning coastal views. The way to the summit is an easy-to-moderate hike up—though there’s a steep flight of steps—and you’ll be treated to some of the best views on the island. There are also many lookouts surrounding the crater. If you have limited mobility, don’t worry, multiple other hikes within the park are accessibility friendly. It can get busy (and hot!) so try to reach early in the morning and bring sunscreen and plenty of water. Online reservations are required for non-residents but are often included in guided tours of Diamond Head. – Tripadvisor