We went up to the top for the magical sunrise. Absolutely breath taking. After talking to the knowledgeable park rangers at the visitor center and going to the official summit we stopped at the Kalahaku and Leleiwi Overlooks as well. Not very far of a walk from each parking area and totally worth it. Both give you very different views of the main crater that from the top. Sadly we didn't have much more time. Otherwise we would have done a bit of the Sliding Sands Trail.