The following activities are prohibited in Sitka National Historical Park—
    
    
    
        
        (b) 
         Riding a bicycle, except in the public parking areas and on routes designated by the Superintendent. Routes may only be designated for bicycle use based on a written determination that such use is consistent with the purposes for which the park was established.
     
    
        
        (c) 
         The use of roller skates, skateboards, roller skis, in-line skates, and other similar devices.