The Abel Tasman is the smallest national park in New Zealand. However it has unique features of forest, coast and sea nature, and suitable place for ecotourism, that is sustainable tourism for both of nature and people. It is also the best style of tourism for local people. In limited amount of funds, guides of bush walk or sea kayaking are easiest methods to start ecotourism. If you guide them, tourist can be close friends with nature and learn them well. Department of conservation will asses you for concessions, please talk to local branch. They are to protect environment with developing ecotourism. You can corporate with Information-centre, accommodations or other tourism industries to manage business and receive booking. That means some guides would share Homepages or booking systems and work for each other. So, you can save cost for advertisement and tourists can make booking easily. On the other hand, development of ecotourism would destroy traditional environment. So DOC might make entrance narrower to start ecotourism as more people start the business. That means regulation in the national park could be strict more and more in the future. You need to keep following it.