BLUFF OYSTERS Bluff is one of the oldest European settlements in New Zealand. Come here to enjoy the scent of the sea and the rugged character of an oystering port. The port of Bluff is the gateway to Stewart Island, and home of Bluff oysters – reputed to be the best in the world. The oyster season runs from March to August, and in May the locals put on a lively festival to honour Ostrea chilens..