My father, cousin and I are planning a trip from PA out to Boise at the beginning of July. We plan on camping 90% of the time, and are more interested in national parks and hiking, but wouldn't mind a few hokey tourist spots along the way as well. The biggest pressor is time, with only about 10 days to head west (they are driving back without me and I think will just be powering through the trip). So far we are thinking of Mt rushmore and the Crazyhorse monument in SD, and we would like to spend a few days (2 or 3) in Yellowstone. Any suggestions, including routes we should take or other things to stop and see?