For over a decade, a wilderness outing program in Michigan's Upper Peninsula has been the object of continuing research focusing on the impact of an intense nature experience on people's lives. The results discussed here are based on the questionnaires completed by the 49 participants in the last two years of the Program. A consistently striking finding of this ongoing research program has been the richness of the psychological benefits obtained. Based on familiarity and preference ratings of photographs, reactions to the solo experience, and ratings of moods and feelings both before and at the conclusion of the Program, the results speak to the pervasive power of the wilderness environment experience. It is suggested that the implications of these findings may transcend the particular environment. The psychological dimensions reflected here are likely to be vital aspects of effective human functioning in other settings as well.