The location is very convenient, especially to MGM. It really is right in the middle of everything, so you should have no problems with that.
As for decorations... they will have a Caribbean flair, and you will see them in Olde Port Royale, and likely the area in which you check in. This is the only moderate who separates their check in area from their eating and shop area.
It will definitely give you the beachy type feeling it sounds like you crave, though!