I may be biased by the fact that I live a run-able distance nearby, making this the perfect workout spot for me. I usually run up and down the KCC hill and then make my way around to this workout station and in my opinion it is the most perfect overall workout that I could get for the great price of $0.
Relatively new and located next to the vehicle entrance of Diamond Head Trail, the Bryan Clay Exercise Park has multiple machines for arms, back, sit ups, pull ups, ellipticals, etc. It basically has the efficient and body-weight powered version of your usual gym machines but available to the everyone without the cost. The machines are awesome in that they don't use typical weights, they simply use your body weight as resistance. There are also small instructional stickers on most of the machines with diagrams to show you if you're simply just starting out :)
Overall, if you live nearby or are in the area after hiking the Diamond Head trail, I definitely recommend stopping by and getting the most out of your physical work out day. It's fun, people in this neighborhood are generally friendly, and you'll also get a nice view while working out. What's better than that! read more