This is a survival island that i just so happened to get when i was generating a world.
WARNING: you will spawn under water so press space when you spawn!

This island includes:

Cave
Tree
Not that much grass

If you find like a dungeon or something underground in the cave please post a comment on it!

Hope you like the seed!

Picture URL: http://imgur.com/a/ZTAmU

Seed: 3669210630453429468