If you are new to hiking you may find this a challenge. The humidity here is something to get used to, so pack some water for your hike. I like to hike, and this did not take long at all, maybe 40 minutes to the picnic area from the east trail. It was muddy in parts, so wear shoes with a good grip. The rocks on the trial can be slippery too, so watch your footing.
I agree that this is not a well mark trail, so stick to the main path, which is evident by all the shoe prints. There are a few shortcut that have been created by hikers between the trees and on steep inclines, but they can be hazardous. The trail does wind its way up in a zip-zag incline.
On the way back down, take a little extra time for the photo opportunities. There are a couple rest stops and even a few peek-a-boo views in the trail looking to the north of the Island. Pack flip-flops in your car, so you can change out of your muddy shoes when your done. There are no amenities/facilities here, so stop at a gas station on the Highway before you take to the trail. Aloha!