Description: MTB Sun Valley. On a beautiful day in Sun Valley I visited the single track trails called Warm Springs and Cold Springs. I was able to stay on the trail for the most part. The lifts are great because they have a special "chairs" designed for mountain bikes. Make sure you bring tubes and a pump with you because many people get flats. WS and CS are about 10 miles each but remember you will have to ride back to the riverrun area to catch the lift back to the top. I could only complete 3 laps because my hands were raw and blistered. The trails are not as good as Tamarack (no jumps/berms) but I had a great time anyway and will return.