There's no shortage of epic hikes on the island of O'ahu, and a personal favorite is Koko Head Crater. Access to the trail starts at Koko Head Park in Hawaii Kai. Once you find the abandoned railway, it's a straight shot to the top!
My girlfriend, Anna, and I made the 1,050 stair climb up Koko Head in a little under 30 minutes. Our pace allowed us to catch sunrise, but, man, was I winded at the summit. 3/4 of the way up, I may or may not have told her to go on and finish without me... I'm glad she didn't allow it — what breathe I had left was stolen by the imminent view!
Looking down the abandoned railway of Koko Head from near the mountain's summit. // Photo is my own
Sunrise from the summit of Koko Head // Photo is my own
Looking up towards the summit of Koko Head from the base of the abandoned railway. Only 1,050 stairs to the top! // Photo is my own
A little past the half-way point the railway suspends 10 to 20 feet above the ground. Crossing is a bit precarious and not for those who fear heights! // Photo is my own
Note: We started our hike around 5:30AM. The above sunrise photo was actually one of the first photos I took on the hike. The others were take upon our decent.