Great question..after reading the article, what has come to my attention is:
420 acres is a vast area for outdoor involvement with a dozen or more groups, seems like there is plenty of space available for all.
However, it sounds like it has gotten out of hand. Obviously the view and weather can be spectacular based on its popularity and surely it is less expensive than a brick and mortar building.
If the instructors business license, permits, insurance and all required fees are valid, then they have the right to function at the park based on the city’s requirements (quite cheaply I might add).
So the city has to examine the “beast” that has been created. Some possibilites could be:
“Designated specific space/s” for those classes to avoid impeding on other people, family, children, pets and events that are there to enjoy a peacful day at the park.
“Limit days and times” of the week in which classes and class types can be held.
“Raise the fees”/not regulate gross income: include in those fees park specific business types and charge according to their environmental impact to the park with specific limitations of what can and cannot be used in the park ie: trees, benches etc., to perform any exercise on. Trainer’s must supply their own equipment.
“Fines”: Levy stiff fines for those who don’t comply.
Any final decision the city will make will not please everyone nonetheless, it sounds like it has to be done and i’m sure the “majority” of parks users will be happier.