Suggesting that outdoor activities can be positive learning experiences, lesson plans and activities were designed to demonstrate that the outdoors is an interdisciplinary classroom, to be used on virtually any school site, and to teach subject matter taught as part of the standard curriculum. Seventeen interdisciplinary ideas with correlated activities for language arts, social studies, science, health, mathematics, art, and music are provided. Subjects of these ideas focus on insects, shadows, ball park, curbs, birds, parking lot, asphalt, leaves, flagpole, playground, open area, wind vanes, natural area, weedy area, grassy area, telephone poll, and trees. Twenty-eight lesson plans are also provided. Each lesson plan includes title, subject area, grade level, goals, skills fostered, purpose, performance indicators, materials/resources, instructional strategies, and references. Titles include the five senses, differences/similarities, trees, outdoor sets and counting, cloud shapes, litter critters, sunlight/shadows, outdoor shapes, how does it feel, mapping, cracks, hop/skip/jump, riddle-diddle, vehicle adventure, what happens to leaves, cinquain, litter recycling, dichotomous key, fraction fun hunt, echoisms, natural resources, air mail balloons, pacing game, verse-three ways, temperature of school wall, and measuring a shadow. (JN)