Actual rock climbing is only one element of this adventurous outdoor birthday party. The fun begins with appropriate invitations, made from -- of course -- small rocks, cord, and oak tags.
When the kids arrive, greet them with name tags, fashioned from carabiner-style key rings that they can take home with them. (A carabiner is an oblong metal ring used in mountain climbing as a connector and to hold a freely running rope).
Then, to help keep their energy up, supply each child with a water bottle and a bag of gorp.