It would help a lot to know the reason for the rule. Perhaps the park is filled with lots of rare, delicate plants and only narrow dirt pathways. Or perhaps the pathways are somewhat wider and allowing in a wheelchair or a small wagon wouldn't be a problem.
Without knowing the reason, it is hard to make a wise decision. At least for a problem like content moderation, people will have some idea about the goals or reasons for the rule, although certainly different people may have different opinions about how important the various goals and reasons are. But trying to enforce an arbitrary rule without a good understanding of why, on which to base judgement calls, sounds foolishly futile.