My boss recently took his family on a trip to Fiji, with Tui Tai Adventure Cruises. He raves about it. He’s been on safaris in Africa, tours in the Galapagos, India, the Amazon, many exotic places, and he says Tui Tai is the absolute best he’s experienced. Their web site does look like it’s an amazing experience: www.tuitai.com
The web site shows they do a lot of good humanitarian things (humanitarian expeditions, donating wheelchairs, supplies, water tanks, emergency assistance to remote island villages). Cool example of how you can go on a great luxury-adventure vacation and at the same time really make a difference to a developing country like Fiji.