Minecraft Seed: diamonds!!!
At first glance you seem to spawn on a tiny little island close to a lot of other small islands. However, hidden underneath these cute little green patches are not-so-cute lava pools en mass everywhere with absolutely every single ore, coal to diamond. I have not explored this place thoroughly but from what I have seen this isn’t a playground for little girls. This is for advanced skilled miners at the top level. If you dig down through the little island you spawn on it will be about 10, 20 blocks down until you reach the caves. However if you go to the biggest island you see with the trees on there is an opening down into the caves so you don’t need to mine down.