Hello experts! My husband and I will be staying in Te Anau for two nights (7 an 8 November) and plan to take a daytime wilderness/nature boat tour to Doubtful Sound, departing from Lake Manapouri. It looks like there's an early morning departure about 8 am and another about 1030 am. We're looking for a smaller boat and smaller group. Any idea which tour might fit our needs? Is Real Journeys the only company to use? Do we need to book ahead? Thanks for your advice; the What To Do listing isn't clear if there are more choices. Your recommendations are appreciated.