And money, because nearly everything costs more than in major commercial centres. Food, fuel and consumer goods are shipped a long way to get to Nunavut, and they cost a lot when they arrive. There are other options. Or you could camp, but you'd have to know what you're doing to be safe. And if you take one of the guided cultural trips offered by an ever-growing number of Inuit outfitters, you might find yourself sleeping in an igloo as part of the deal.
Safety is another thing to keep in mind.
Virtually every tourist-type activity has local outfitters attached to it or is offered via package tours, and not just as an attempt to make money. You don't particularly want to be wandering in the wilds on your own. You have to know the lay of the land. If someone wanted to go sea-kayaking, the sea around Pond Inlet, for instance, is very different from what people are used to down south. And the weather can change so quickly.