Plants selected for their nectar and caterpillar food. Be sure to include several species that bloom when children are in school. Plants selected for their aromatic, textural, visual or edible qualities. A patch of harvestable berries such as blackberries, raspberries, blueberries and huckleberries. Art - There are many types of murals, blacktop diagrams, sculptures and other art related projects that can be done to enhance the outdoor learning environment.
Many good references are available for playground design.
Check the resource section for a list. Hills - One, or a group of small hills can be constructed with excess soil. This seemingly strange feature can add to the diversity and enjoyment of playgrounds. An open or enclosed lookout tower can be built on top of a hill. Shade - Plant shade trees throughout the site especially near the playground.