I am buying a permit for the Salt River in April. I am not very familiar with this run and I was wondering if mid April was the good time to go? I was also wondering if I wanted the "White Mountain Recreation Permit" (very expensive) or the "USDA Forest Sevice Visitor Permit"? Do I need both to do the upper and lower sections? How many days for both? I am looking for the most whitewater possible with the most difficult rapids. Like I said I am not very familiar with this river just what people have told me. Any information or experiences would be greatly appreciated.