The use of nature and its resources have diversified greatly in recent years. Amongst this diversification, the cooperation of the users in conserving the area is important for sustainable use of the nature. Outdoor recreational activities have been considered as one such sustainable use of nature, as they are related to environmental education and environmental conservation activities. In Japan, only a few studies focus on the relationships between the outdoor-recreation activities and their effects, in terms of 1) degree of environmental conservation awareness and 2) the environmentally friendly actions. The aim of this study is to examine the relationships between outdoor recreational activities and the two effects, by a review of previous studies and a questionnaire survey of canoeists, as an example for recreational outdoor activities. The review of previous studies showed that there was a tendency for the outdoor recreation to improve the environmental conservation awareness, but not the environmentally friendly actions. Furthermore, conservation actions conducted by canoe-organizations were effective. The questionnaire survey showed tendencies for increases in the degree of environmental conservation awareness and the environmentally friendly actions with the increase in the canoeing time. My study clarifies that canoeing has strong relationships with the environmental awareness, but transition to environmental-friendly actions can only be observed to a limited extend.