100
Checking cans around the trail; trash pick up on the trail; fill bird feeders; sweep dock, ramp, steps, sidewalk; walk dam and parking lot for trash and goose poo; take magnetic wheel out on beach and dam; spray out canoes and jon boats with garden hose; sweep up and vacuum visitor's center; wipe down outside counters and shelves; make copies of needed brochures and restock holders; take out trash and recycling from behind the front counter and concessions; fix fishing poles; wipe down railings around deck; power wash deck, ramp and sidewalk; weed the garden beds; use the weed eater to tidy up around dock and steps, in front of deck below the viewing machine; etc.
What is what you could be doing besides sitting behind the front counter when it is slow?