Diamond Head State Park has a a trail to a summit of a volcanic tuff cone & former fort with panoramic views. Make sure to get a permit before you go as they do limit visitors each day. You can do so online. Parking is limited so I would recommend getting dropped off if possible.
Check out all of my photos to inspire you to visit.
I had the best time in Oahu and cannot wait to return. I hope this post inspires you visit.
Thank you all for reading, and stay enthusiastic!
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-Maira