Hug a Tree
Divide your group up into pairs. One member of each pair wears a blindfold. The other member leads her to a tree, by a circuitous route (maybe having her duck under imaginary fences, etc). The blindfolded girl examines the tree by hugging it, feeling the roots, stretching up to reach the branches, feeling for leaves etc.
Then her partner leads her back to their starting point, again by a roundabout misleading route. The blindfold is then removed and the girl must now find \u2018her' tree with her eyes.
Keep in mind that mature living trees are not the only trees! Little sprouts and fallen trees qualify too.