The Diamond Head Hike may be the most iconic hike on Oahu. It’s a rather easy hike from a crater to the top of the volcanic cone that offers awesome 360 degree views of Waikiki and beyond.
It’s very popular and will be crowded. There is a surprisingly small amount of space at the top so be aware of that.
There are some really cool spiral staircases, tunnels, and a pill box at the top.