I told my friend to try this seed. He said that there was a hole in the ground on a hilltop near his spawn. It was about a 15-block drop to a small overhang leading down a steep slope into a cave. (Tough to describe.) To the left of the drop is a 3x3x4 (about) cave that can easily be converted into a base. There is plenty of coal outside the base, and even some iron nearby. If you drop down into the "main room" of the cave (right inside the entrance) you will find a waterfall with gold right next to it.
If you like exploring giant cave systems , or "CAVES OF INSANITY!" then this is a really good world. Just make sure you have enough blocks or ladders to make it to the top.
The entrance to the cave is on a flat hilltop. There are some trees on the hill on the "north" that lead down to the ocean (I only found it once and the game crashed before I could get coords or directions) and a desert biome to the "west". I'm sorry my description is lacking, I will try to find the cave again and post a better description.
The seed is: 252pies
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What is a creeper, you ask?
You can generally find one if you look behind you at any given moment while playing Minecraft. If that doesn't work, Google "Minecraft".
theres a cave in seed "404". if you spawn on a sand island there is a lake on it with a gravel beach. dig in the gravel until a ton of it falls and down there is a HUGE cave system. diamonds, coal, iron etc everywhere along with tons of lave =)