Abstract
This paper shows how to think about Ecotourism at coast. Sustainable development is important to practice Ecotourism, especially in the case of using tourism as measure. However Ecotourism is equal to sustainable tourism. The sustainable tourism is a social system, which has three phases. There are the nature environment and the social environment in order to bring Ecotourism at a background. And these environment is located the materials for the social system.
The sustainable tourism is discussed at the first in this paper and next Ecotourism as a materials in such social system is discussed. At the last, thinking about Ecotourism at a coast, it show the situation in the Ecotourism in Okinawa.
