The trail is graded (i.e. cut in the ridgeline) hence it is fairly easy to navigate. The hike to the top might be accomplished in about an hour for speed hikers. Add 30 minutes for those hiking at a more relaxed pace. Be ready to get muddy and wet.
Near the top is the Cline Memorial (pictured here), put there for HTMC member Geraldine Cline, who was tragically killed in an auto accident many years ago (no, not on the trail). There is even a memorial fund in memory of Cline.
Also at the top is the Koolau Summit Trail which can be hiked northward to Pupukea and southward to Kipapa.