The Big Island has to be distinguished between the east and west sides. The east side (Hilo, Volcanoes Park) gets lots of rain (that's why it's so pretty and lush, and even if you're staying Kona-side it needs to be visited both to see it and to experience "old Hawaii" that's harder to do Kona-side). But the west side/Kona-side gets little rain. That's why all the resorts are there
