I was looking for a multi-leveled fantasy sort of island. I never really found it. So I decided to create one for myself! There isn't much place to actually build, but this map was made to be pretty, not efficient...in any way shape or or form 
This island is fully connected, with 3 incoming and outgoing highway connections, 2 train connections, a boat route and a plane route going through it.
You have about 38% buildable ground, but as I mentioned, just a fun map to play! Hope you enjoy
http://steamcommunity.com/sharedfiles/filedetails/?id=417576088&searchtext=skull+island
This island is fully connected, with 3 incoming and outgoing highway connections, 2 train connections, a boat route and a plane route going through it.
You have about 38% buildable ground, but as I mentioned, just a fun map to play! Hope you enjoy
http://steamcommunity.com/sharedfiles/filedetails/?id=417576088&searchtext=skull+island