I feel like activity_panel is better than activitypanel. Same thing for climbing_frame vs climbingframe. Same thing for climbingwall vs climbing_wall. Is it not clearer to read with the words appropriately separated? What would be the specific reason to combine them? The playground keys are too inconsistent in their usage of underscores vs no underscores to really outline an established trend imo. It feels like it's better to at least prioritize readability.