DH and I hiked Diamond Head in June. It was definitely worth the early morning wake up call! Here’s some info from a trip report I did...Thank you all for the replies, I'll put it back on my list. And be sure to go early.
DH and I hiked Diamond Head. And it’s noteworthy because I got to put my Disney skillz to use, because getting to Diamond Head is basically like rope dropping SDD.
The park opens at 6am. We left HHV at 5:17 and arrived at Diamond Head at about 5:30. We were the 6th car in line, and the line QUICKLY grew behind us. We got to watch the sunrise while we waited for the gate to open, which it did at precisely 5:58 (a local heading in on foot gave us a heads up on the time).
We paid $10 to park, parked, and then bought trail tickets ($5 apiece at a kiosk). It took us an hour total to get to the top and get back down. I’m so so so glad we did it this way. Heading up, we could go at whatever pace we wanted, and there was plenty of room to pass or be passed. And, obviously, we weren’t sharing the path with anyone coming down from the summit. Even when we were coming down at 7am, there was a steady stream of people both going up and coming down, such that the “going up” folks were basically walking in a single file line, at the pace of the person in front of them. Also, we had zero crowds at the summit to take pictures, and also at the lookout points along the way.