Isolation is part of the attraction for Harry. It's the quiet. And the fact The Cook lives on the mainland. And maybe the fact those 12 kids are scattered like driftwood. Must've been pretty noisy in his life at one point. It's not noisy here. Even the engine of the boat has been stilled. The only sound breaking the silence is the yelping and the slobbering of the excited dog.
But as with any island nation, there are drawbacks to the isolation. Like the pirates.