Buy a travel guide to the South Pacific
. At the beginning of the guide, there is a summary of the BEST diving places. At the end of each chapter/island, you'll find recommended dive sites; I use Frommer's South Pacific, from Amazon.com. Although not all listed information is accurate, it will at least give you which islands to go to. In French Polynesia
, the best dives were at the Rangiroa atoll; you need to be at least an Advanced Diver and can handle very fast currents. At Australia's Great Barrier Reef
, the best place for diving is Lizard Island; take a boat load of $$$$$, before considering the trip. I know of a few remote
atolls that I keep to myself; diving them is a feast to the soul, and I am not sharing their locations. Dive away!