I wish I did have some tips man. I'm green AF and have a speargun sitting here that I've never even completely loaded yet.Before i left on deployment i was absolutely crushing from my yak with a shiny clear mirror bottom/black top yo zuri minnow diver...slow trolled 2-3 mph. Bonito every trip, big jacks kings, spanish...it was the hot lure for neashore this season for sure!
I'm on Okinawa for the first time now...you got any pointers for shore fishing or pole spear (snorkeling)?
Best advice I can give (having also been to Oki) is make friends with the locals and learn what they're doing.