The use of roller skates, skateboards, roller skis, in-line skates, and similar devices is prohibited—

(a) On the Savage River Loop Trail; the Savage Cabin Trail; the Triple Lakes Trail; the McKinley Bar Trail; and the Eielson Area Trails; and

(b) Within the Frontcountry Developed Area as defined by §13.970 except on trails and areas designated by the Superintendent. A map of the designated trails and areas is available for inspection at the park visitor center and on the park Web site.