The hike to Diamond Head lookout is narrow, crowded, and steep. During the climb, you will navigate through historic WWII pillbox bunkers and near verticle stairs. Once at the top, however, the view is worth the effort.
Start early and secure your tickets in advance to beat the crowds and watch the sunrise. From the lookout, you can get a great view of the surf in Waikiki- the best way to get an early workout before going for a standup paddle board surf in Waikiki after.