We hiked "Koko Head" after we hiked diamond head. It was pretty fun but I will advice you to hike diamond head as early as you could, as much as possible before 8am or you will regret and might not enjoy it. For me its a fun hike the only complain I have is we had started late and that day was hot. I felt like the sun sucked up all my energy and I felt drained for days. I am ready to do it again though, maybe next weekend.