Any tips of things to do and see in New Zealand during August?

Me and a mate are planning a trip to new zealand for about 3 weeks in august. We want to do some snowboarding for week or so and then want to see some of the country and do some other things. Any tips on things to do or see, where to do them as well as the best places to go for good boarding. Tips for cheap flights, accomodation and travel would be great

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