I hit a few small beaches and the Princeton resort beach yet came out with nothing worthy of posting. The pickings seemed slim. Targets were spread very far apart so I would assume that these beaches have either been hit hard or the tide washed everything away. I did get to meet a local who just came out of Poipu beach with only coins. He was using an underwater setup with snorkel mask, weighted belt, wetsuit, and a pulse induction metal detector. I was unfamiliar with the brand but it looked to be a quality machine. Although I didn't come out with the big gold piece I was going for, I still had an amazing time enjoying the sights, swimming in the water, and fighting sunburns.
Mahalo!