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I am looking to get your adivice and experience in diving Micronesia. Thanks.
We just came back from a trip to Yap (1-week) & Palau (1-week). Both are great destinations - but if I had to just choose one, I would have to agree that Palau is the better location. There is certainly more variety in the diving and more fish life in general at Palau. We had a great experience with Sam's Tours in Palau and highly recommend them.
However it is Manta mating season for the next couiple of months in Yap, so there is a chance to see large chains of Manta's. If you do decide to go to Yap, be sure to check the tide charts. This time of year the mantas are in M'il channel. The channel is highly subject to tides to keep the visibility reasonable. You want to go when there is the greatest difference between high and low tides (typically around Full or new moons).