As far as a beach vacation, most of Europe is out because you're going potentially in early October. Parts of Greece are at the top of the list of few European destinations where you'll have reliably warm temperatures and relatively pleasant weather during that time.
As far as Central and South America, you would be going during rainy season. You might luck out and it only rains for 15 minutes a day or you might not.
Come up with a list of priorities of what you prefer from the vacation, the sights you want to see and then ignore the list while booking travel to Hawaii.
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