LOL Anything you can improve... you're funny. That is a really nice map!
I guess if I were to really, and I mean really, get nitpicky I would say the hashing on the ocean needs to be reduced.
Typically that style of hashing only goes a short distance off the coast it doesn't fill the body of water.
As for the rest of the map.... I'll have to look really close at the whole thing since there is nothing that jumps out at me.