It's an Archipelago of about one hundred islands, nestled in the gulf of Kyushu, the largest of which are Ueshima and Shimoshima, these are connected by bridges, so it's possible to ride them from Kumamoto to Akune (Kagoshima prefecture), or the other way around, with only one fery ride, from Nagashima to Shimoshima (around 750Yen, 30 minutes).
The whole Island ride, on the route we did, is around 140km, mostly flat with just a few small hills.
Coming from Kumamoto we finally hit the coast around Uto, the vegetation is tropical, the sea not much yet. It's a peninsular area with shallow muddy water and many fishing boats.
As we pass the first bridge to the island of Amakusa suddenly we're in paradise. Like switching from Riccione to Pantelleria in a few kilometers. We immediately dive into the cristal clear water! The first real great beach in this one-year-so-far bicycle trip!