<prompt> Translate the following text to EnglishMzunguko wa 13 maili 21 km katika Red Rock Canyon, huchukua baiskeli kupitia baadhi ya mandhari ya eneo hilo na sio ushuru sana.  <response>: One the 13-mile 21-km scenic loop at Red Rock Canyon , takes cyclists through some of the areas more picturesque landscapes and is not overly taxing. 