It has a giant fountain in the middle as you can see from the picture. All the roads are canals and from what I understand, the fountain acts as a means of stirring the canals to make the water flow. However the island is slowly sinking. It's famous for having the most and best shipwrights in the world and it's the island that the sea train first started at.

Oro Jackson, Gold Roger's ship was built here.

The mayor is named Iceberg and he runs the Galley La company which combined all the original different docks and companies of the island into a more professional set. It has some of the best money changers of the world here so I guess if you had a large enough quantity of money from your world here would be a decent place to get it switched over.

Anything else?