Columbus Outdoor Pursuits (COP) is a volunteer-based nonprofit organization in Ohio that has offered outdoor educational and recreational opportunities to its members for 63 years. COP day and trip programs focus on outdoor activities such as bicycling, kayaking, hiking, and rock climbing. In addition, COP offers classes in the skills required for such activities and training for trip leaders. During the 12-month period ended July 1999, COP offered 721 day trips, 67 weekend trips, and 15 longer trips or programs for a total of 41,738 trip-participant-days. This paper describes the structure and administration of the organization, as well as some of its major events. Sections on the organization and its administration cover the mission statement, members and their responsibilities, requirements for being a trip leader, leader responsibilities, leadership training and organizational support for leaders, the role of volunteer "activity chairs" who administer individual activities or projects and recruit trip leaders, the duties of the executive board and its officers, duties of four paid employees, how the bills are paid, the monthly newsletter, and the recruitment and training of volunteer successors. Classes are listed, and major events are briefly described. Appendices present the organizational structure and some of COP's operating guidelines and policies, including details on risk management. (SV)