Here are some free resources you are welcome to download and use! Share widely.
Why Outdoor Play - this one page illustrates the four reasons/benefits of outdoor play: nature connection, sense of place, physical health and well-being and curiosity and learning.
How Outdoor Play - this one page is targeted at parents and caregivers and gives simple tips for getting outside with young children.
7 Play Principles - this is a one page summary of David Sobel's nature play principles. These are from his book Childhood and Nature: Design Principles for Education.
Play Zones - this one page is a summary of the Play Zones described in the text book Playing and Learning in Early Childhood Education by Beverlie Dietze and Diane Kashin.