bridges made of planks and tree trunks (Fotoalbum Springzaad)
"A Case Study in Outdoor Design: Berlin Playgrounds (1: Choice)" Ground for Learning. The first of 8 wonderfully illustrated documents about playground design in schools, kindergartens and public areas in Berlin. Fantastic must-read documents! The other 7 focus on different elements of design. You can access them from the website by clicking on the http://schools.ad link.
HiMama - Benefits of Natural Playgrounds for Child Development
LOVE! design the playground around the natural landscape, for the lanscape is in itself a playground :)
naturalplaygrounds.com tunnel and bridge ~ great resource
concrete water channels (designed by EarthWrights--their company has created inspiring designs from nature for children's playgrounds, allowing children to be children and use their imaginations--awesome!)