This is a relatively calm hike, with nice views all the way up. You can't park near the trailhead, so I parked down at the beach and walked up to it.  Less then a 10 minute walk. There are several bun/thigh buster spots, one right in the beginning, but they are over quickly.  No real shade on the way up, so I would definitely bring enough water and sunscreen if you burn easy.  There are 3 pillboxes, spread apart almost evenly.  There are plenty of views on the way up, and on the sunny day I was here, there was a nice cool breeze in several spots, and a really nice breeze on top of the pillboxes.  You can go inside each one and check out the artwork left behind by previous hikers.  I started this hike at 10am.  I would probably go a little earlier if I were you, to beat the heat, if the heat gets to you easy.  This seems like it would be a great early morning hike to watch the sunrise.  The trail can be slippery in parts, especially going down.  I always wear removable spikes on every hike I go on, even if it seems like I wont need them.  I think I will do this hike again to watch the sunrise and go all the way to the 3rd pillbox.  I only went to the first two this time, because I was heading to Waimanalo Beach next, to document this beach for my site.