I found a world that I explored (on creative, I might make one for survival if I have the technology to change the gamemode of a world). I spawned in a vast ocean, explored the whole of the map (item) and there were only a couple of islands around the map. So I will make a town or type of structure on each of the islands creating a widespread community that you can enjoy also
Structures that might be on the islands:
. Towns (varaiting in sizes)
. Prison on one of the islands
. Millatary installation/barracks, (might be on the largest island)
. the towering city (might also be on the largest island)
I will keep you posted about the percentage completed and what I have added, also if I have the the technology, I might make it a server.
If you want to make the world yourself, the seed is at the bottom

It is now finished, click the link to download, please enjoy.

To install this world, extract the .zip file to wherever you want, then cut and paste your newly extracted folder into your saves folder in .minecraft. Hit windows then R to get up the run screen, type %appdata% into it and it will take you directly to the .minecraft folder. This is for Windows, I'm not quite sure how to install it for mac.