I visited Hawaii on vacation and had the opportunity to get a few jumps in. I called both dropzones only one picked up the phone... Pacific Skydiving Center.
Great DZ, full of fun-jumpers and lots of loads. The only downside is that it closes early like 1 or 2 PM due to the winds picking up daily around that time. Now this was in January, I can't attest to the other times of the year.
I had a good time, gear rentals were a little steep but oh well.
The PAC-750EX carries up to 20 jumpers and load turnaround times are about 15 minutes, so you're only limited by how fast you can pack.