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They are so close that you would be diving many of the same spots if you stay on one or the other.
What he said. I was in Zamami last May and the water was nice, clear and blue. Nice corals and fish but I think the biggest I saw was a turtle. Did 5 days of diving and didn't do all the spots. Don't remember seeing big stuff as I am a fan of that as well.
Down south to ishigaki! there are some manta cleaning stations and that was my first and it was awesome there! Next on my wish list is Yonaguni ! Hammerheads and lost city... Probably 2016.