Fish 'n Fins is virtually synonymous with diving in Palau. Rest assured that you'll absolutely dive the best of Palau with them, including some of the great wreck sites. Land-based diving doesn't get better.
Manta Ray Bay is the place to stay and is the best organization for divers in Yap. All dive facilities are located within steps from the hotel and, if you love mantas, this experience is beyond belief.