Description: This seed spawns a massive island (and it is quite large) that is shaped like Japan! There is a multitude of biomes, so there's no need to worry about resource diversity. Throughout the island are villages, pyramids, and a witch's hut.
What's cool: Right where Tokyo would be, there is a Village. Hokkaido is also represented on the map, though not exactly in the same shape as the actual island of Hokkaido. The island is also fairly distant from the rest of the continent, making it actually feel like you're isolated from the mainland.
What's different: The shape of the Island is a little thicker than Japan actually is. Hokkaido isn't shaped the same, and there are a lot of stray swamp biomes that jut out into the sea, somewhat ruining the shape of Japan. There is also a large island south of where Tokyo would be, which is unrealistic. To top it all off, Japan is formed from hundreds of island, while this map is made of 12 or so (Though that's fairly realistic for Minecraft).
Below are two pictures. One of the actual map as seen on Amidst, and the other is an actual map. Compare the two and decide if you like the seed or not.