One of the best kept secrets of the Society Islands is Raiatea/Tahaa.  You have everything from drift dives through the many passes (there are 11) to drop offs, pinnacles, caves and coral canyons. Here you'll find beautiful black, yellow & purple coral walls. Raiatea even has a wonderful wreck dive -- it's the three-masted ship called the Nordby and sunk in 1900. In terms of fish, you'll find Silver and Blacktop sharks, Napoleon Wrasse, Moray Eels, Sea-pike, Trivially, Tuna, Leopard Rays, Grouper, Barracuda and Dolphins. In addition, there is a large assortment of nudibranchs. I'f you're able to visit July-October you'll have the chance to see Humpback Whales. July-September you have the chance to see Manta Rays. Raiatea/Tahaa is a great dive destination that has something for every level of diver.