Second puzzle, it's a Nurikabe!

Well here's my second puzzle, not sponsored by the number 2, this one only contains 1s, 3s and 4s. Still It's a nice starter to Nurikabe so for those of you infamiliar to Nurikabe here the rules and a simple example.

http://puzzlevalves.blogspot.com/2010/01/rules-for-nurikabe.html

Enjoy!