The 1980s saw a dramatic change in the use of leisure as millions of Americans turned to vacations that emphasized exploration, learning, and renewed awareness of the natural world. The first part of this three-part sourcebook lists approximately 270 institutions, organizations, and businesses offering programs in outdoor education, environmental education, nature study, wilderness adventure, and various outdoor activities. Entries are listed alphabetically in seven categories: (1) college and university programs; (2) nature centers and natural history museums; (3) field institutes and natural history associations; (4) clubs and national associations; (5) tour agencies and lodges; (6) miscellaneous organizations (focusing mostly on photography, fishing, rock and mountain climbing, and sailing); and (7) programs based in Canada, Great Britain, France, and Latin America. Most entries contain address, phone number, program description, and approximate cost. In part 2, 11 vignettes provide animated personal accounts of varied programs. In part 3, indexes cross-reference entries by subject or orientation and by regions of the United States, Canada, and the world, and list those programs offering courses for college credit. Subject categories are biology, birds, family orientation, geology, mammals, marine science, Native Americans, outdoor leadership and survival training, photography, plants, rain forests, and women only. An appendix lists 28 books, periodicals, and information sources about outdoor learning vacations. (SV)