Doubtful Sound can only be accessed by crossing Lake Manapouri and then travelling by bus on one of NZ's most remote roads. It takes a couple of hours to get there but you're certainly rewarded once you arrive. Travelling with Real Journeys, you get to spend almost twenty-four hours aboard the Fiordland Navigator. There's fine food, fine views and a whole lot of information from the friendly staff. I didn't plan on doing this trip. I found myself on top of a mountain with a couple of Kiwis who told me I absolutely had to do the trip. At around $500 at its cheapest, it wasn't on my list at all but I'm so glad I went because it really was as good as I'd been told.