A fairly impressive view, but the best was yet to come
After climbing up the inside rim and going through a kind of multi-story bunker in the crater wall, you crawl through an opening in the wall onto a trail that takes you to a lookout at the top. The crowd was pretty thick at the top, but I think it was worth it.
Looking back into the crater
After Diamond Head we drove to the Halona Blowhole and watched it blow repeatedly as the waves came in.