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THEJOCK Assuming it's not late Oct. What about Amanoi? that might be a great option. While the beach isn't the main attraction and it's not a standout (the beach club is actually fantastic, though), at least it still has a beach and so many other aspects to appreciate there. Not to mention one of the best Amans at the moment. Amanjiwo is a great Aman but like you said, no beach. And views from an Ocean Pool Villa is stunning!
If it's early Oct, then Four Seasons Hoi An might still have a decent shot at being clear but I think the weather will likely be better at Amanoi.