If u wanna play a survival seed this a good one ( not much on island, put bonus chest on) and if u dig stairs at the right part of the island u'll go into a huge rivine, i only found 2 diamonds so far... Anyway, theres a mushroom biome near the island that does spawn mooshrooms, and no other land masses that i spotted are there, but if u want to check do so, and no animals spawn and the island.
mjolnir