You will spawn next to a rare Zombie Village that attached to a Mushroom Biome! Furthermore, as you explore this seed, you will find lots of Ruins in the ocean surrounding the Mushroom Biome. There is even one Ruins that egenrated on an island as well! Enjoy and have fun exploring!
Coordinates and Pictures
Mushroom Biome Spawn: 292, 4, 4
Zombie Village/Mushroom Biome combo: 390 69 70
Ruins on a medium sized island with trees: 0, 69 -191
Spider Dungeon under Mushroom Biome: 168, 47, 137