No matter which way you drive to Makapu'u trail get ready for some beautiful scenery. The resulting view from the 1.5 mile ride is equally rewarding.
The trail itself is not at all technical but the grade is pretty steep. You can take it easy or really push yourself for a good leg burning. Take is slow on the downhill, there are a lot of hikers on this trail. I usually arrive early in the morning before all the tourists start to show up.
There is a dedicated parking lot for the lighthouse trail so you will not have to park on the road. If you get there early enough parking won't be a problem. By the time you leave it will most likely be packed. At least on the weekends.
There isn't much shade so bring plenty of water. I have never noticed any other amenities.
Clicking on the link above you bring you to Google Maps where directions to the trail are plotted in from Honolulu Airport.
Download the GPX file and use your favorite software to upload trail data to your GPS. Right click on the link and select "Save Link As..." in order to download it.