4am arrival: airport locker?

Hi! My flight gets in at 4am to Rarotonga. Does anyone know if the airport has lockers, and if you can check a bag into them at that time? Does it have certain hours?

There are lockers. Unless they've been upgraded, they look a little worn but they're serviceable. The airport security (they're located across a small parking area from the lockers) will assign you one and provide you with your lock & key. I don't know if they're office is open at that time, however.

Have fun!
Mark