This illustrated leader's guide to exploring trees and forests provides activities which emphasize careful observation of trees and the living things associated with them for youths age 9 and older. Introductory information for leaders explains the uses for trees and the role of trees in the ecosystem. It also gives suggestions for leaders to encourage learning and ensure safety. Following a section called "Fascinating Facts about Trees and Forests" are questions to stimulate thought in groups of young people. The seven activities in the guide are divided into three sections. In Section 1, the group discovers how trees grow. Section 2 introduces the group to the community of plants and animals that live in and on trees. The activity in Section 3 encourages group members to think about how a forest will look many years into the future. Many of the activities require field trips to wooded areas. Each activity contains: (1) background information; (2) an objective; (3) a list of materials needed; and (4) detailed instructions to complete the activity. At the end of the guide are reproducible record sheets for each activity, a list of suggested field trips and activities, a glossary, and references. (KS)