Basically I love this map but it lacks space for water NPCs because its shallow, the middle could be the most shallow but it could downgrade into a coral reef and then a "Shark zone" with some sunken pirate shipwrecks, treasure, whale skeletons and Davy Jones locker towards the outside of the map.

Maybe also a little palm tree island and a Pirates Cove for land areas.

Edit: If not this just a downgrade version of the map would be nice, even if the only difference is depth.