Kokohead Trail is really just a lot of stairs. I did Likeke Falls in the morning and I still had some energy, so I went and did Kokohead before heading home. It’s sort of rough unless you have long legs (because some of the stairs are quite big,) but it’s only 2.9 kilometers to the top.
You park in a paved lot and walk along a paved trail to the base of the mountain. Then you see the stairs, bracketed by railroad tracks on either side. It looks like a long way to the top, but it’s not as bad as it looks.
Fair warning: There is absolutely no shade, nor is there any good spot to rest. I recommend a hat, sunscreen, and a lot of water. Some people do it in the dark so they can be at the top for sunrise, and I hear that is pretty neat.
Kokohead trail is really just a set of railroad tracks that used to run munitions up to the top of the mountain during WWII. For the most part, it’s a fairly safe trail, but there is a spot where the tracks go out over a ravine, and that can be frightening if heights bother you.
People do bring their kids, but I don’t recommend it. First, the college students hike in very little clothes, so you’re going to have some awkward moments when your kids shouts out: “Why is that girl in her bra?” But second, the stairs really are tall and it’s easy for a child to slip on the loose sand and fall down the mountain. People do.
Anyway, the views from the top are amazing and it’s only about a two-hour hike, so it’s worth a look even if you’re only on Oahu for a vacation. Just remember water and snacks. It’s a hot, dry hike to the top.