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Well, I personally have no problem what so ever with the 'Roads all over the place' issue with the island. I have personally been to an island that has roads that far outnumber these roads:
This is the Island of Jeju (or Cheju depending) in Korea (know for having a population of women that outnumbers the men by almost 5:1).
Again, not a very large island (The largest island, Jeju-do, lies off the southwest corner of the peninsula and has a land area of 1,825 square kilometers.) or 1140 square miles. This roughly 33 x 33 miles, while 400 square miles is 20 x 20 miles. So, Jeju is not that much bigger, whith a crap load of roads everywhere, and lot of them Circuitous as well.