We chose to do the overnight trip on Doubtful Sound. It was a very memorable experience. There had been plenty or rain before we arrived but cleared up later which meant we got to see gorgeous scenery and waterfalls. Did the kayaking which was fun. The staff were brilliant and enthusiastic. We were lucky to see plenty of wildlife - hump back whales, dolphins, penguins, albatross, seals and lots of birds. The cabins were nice and clean. The food on board was excellent. We love the 5 minutes of complete silence. A really memorable experience would highly recommend.