A short period of time before the sunset is my favorate in summer. The heat wave during day time ceases and comfortable ocean breeze starts to blow instead.
This wonderful magical time will last only for half an hour, so it would be highly recommended to have such unique experiences on the island.
The port of Ishigaki is one of such destinations, where you could enjoy watching and feeling the charm of this island.
The sun will disappear into the ocean between Taketomi Island and Iriomote
Island and the sky will change its color gradually from light orange to dark blown.
Why don't you buy a can of beer at a convenience store and sit a while along side the wharf which could become the richest place in the world.