Interesting Photo, the only comment I really have is that I can't decide if the subject of the photo is the blue boats, or the castle. But all in all, great photo, and really good composition!
Love the ruins. The orange construction fence is a little distracting, not much one can do about that. Maybe a little photoshoping would do the trick. I would love to see this shot with a thunderstorm moving in behind it.
Thanks for all your comments! Heres a bit about the castle.
It is known as King John's Castle because it was allegedly founded by King John who stayed here briefly in 1210. The castle changed hands several times over the following centuries and was fired upon by retreating Jacobite forces in 1689 and later used as a hospital during the period leading up to the Battle of the Boyne. Now a National Monument, the interior of the castle is inaccessible due to the danger from falling masonry.