Hmm... make sure that there's not too much water. I know that it's a water map, but you don't want to go down the same path as Breeze Island. For the terrain, I suggest either- starting again and using Worldpainter, it's a 3rd party map making program. You could use Worldedit and use commands such as- holding a wooden shovel type //brush sphere (block) (radius) and right click with the shovel. This will spawn a sphere of your block and radius choosing. Continue right clicking in the shape you want your hill to be, and then do //brush smooth (radius) and right click over your spheres. This will smooth them off so they look natural. I think the tree command is //brush tree (tree type) I THINK. Not sure, bit rusty with worldedit. Anyway, good luck!
