That is Ta'aha in the background and to the right is a super expensive and only resort on the island.
Those are 2 red Octopuses. I was told that they are rare to see.
This was the best snorkel spot I saw on all of the 7 islands that I visited. It is in a pass so fresh ocean water is coming in which makes the water very clear and there isn't runoff from the rivers and is also very protected because it is on the far reef.