If you get caught speeding in this area, you will get a ticket costing you nearly $100. Trust me, I know. The police will occassionally conduct speed traps in this area. Going South on Kamehameha Hwy the speed limit is 45mph. I don't know why it is different speed limits on the same highway. Maybe because going South is downhill? There is parking near GZ, where it can be muggle heavy at times, so please be as stealthy or non-obvious as you can. More so when replacing the cache. Be quick, be gone.
Extraction tool, (tweezers, safety pin) will help in getting to the log quickly and minimizing your time at GZ.
Don't speed. It's dangerous for you and the people around you.
Please no spoilers, not that the cache is difficult, but so that everyone can have their own fun.
Happy hunting and hope you enjoy!