This paper provides how crowdness of short-term staying tourists such as recreational boaters influences the involved communities as a whole. Against sustainable future tourism destinations, various undesirable mal-effects could be foreseen socio-economically and environmentally if the destination is over demanded. For empirical study, Dong-River, an upstream of Han River located nearby at Youngwol County in Gangwon Province, recently renowned as a hot short-haul tourist destination, was selected as a case study area. Between 1998 and 1999, some negative social and environmental impacts and also some positive economic impacts were envisaged. Short observation period seems to reveal latent lagged effects to the community whether they might be desirable one or undesirable one for the future of the communties concerned.