There is a good server that has awesome survival games in it. They are based off of the Call of Duty MW2 maps. The IP is mc.aviatorshow.com
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The survival island map is 100% free, there's no cost attached to the seed/world download. If you have paid for it, I'd try and receive a refund.
Build the map on Creative Mode then go to seedscope.net and upload your level.dat for the map on the Change Survival to Creative option. You should then download the new level.dat. Replace it with the old level.dat and when you start Minecraft, you should see that it is now a survival map.
Place it in the saves folder of you .minecraft folder. EDIT: go to this link http://www.minecraftforum.net/topic/110756-surv-★★★-survival-island-★★★-308000-dls-★★★/ Scroll down until you see the downloads, click and download it. Now i dont know how to get the worlds to work in Windows, since i dont use it. On Mac, open Finder->(You're Name)->Library->Application support->Minecraft. Now look for the Saves file, drag you're download world in there and start playing. --- *Feel free to edit for the Windows thingie* Um, yes I have windows and All you need to do is go to start after you downloaded it and type in "AppData" (No "s) and click on it. After that click Roaming then .minecraft. Go to saves and you should see your world. Then Copy the Zipped Folder From the download and paste it in the saves folder next to your world. Then when you start up minecraft
Sprite is a great minecraft seed if you are trying to have a island and only an island. This seed has only on tree and is not completely flat, and also there should be a huge tunnel if you start digging in the middle of the island. But be careful because since there is only one tree you will have to be very careful about using the wood and be sure to plant the tree saplings that fall from the one tree so you can plant more trees for more wood.
First you have to find the specific download on the map online. A wide variety of forums and blogs have this available.
You cannot break bedrock in survival on Minecraft because this represents the end of the map, meaning nothing beyond that point is rendered. You would have to either cheat, glitch or be in creative mode.
Minecraft Skyblock Survival is a custom map for Minecraft. In it, you are on a very small block of dirt with one tree and a chest with supplies in it. You can make a cobblestone generator and use the cobblestone to build and prosper.
You need to download the file, unzip it and copy it to your minecraft folder. The full guide can be found under "Sources and related links" below this answer. First, download the map. Next open your star menu and type in: %appdata% that'll take you to Roaming. Click on the folder .minecraft, click on saves, and unzip the map into that folder. Next, open minecraft and play it just like any other saved game. =] Hope this helped, ~Damoknight
Try MCedit. See the link below.
Its fake! Its coming out in the 2.0 update.
It comes out in the 2.0 update hope that helped! : )