I've seen this question posted a number of times, but still am quite confused because the answers apply to different times of the year... So, here are the times of our trip: After 6 days in YNP we will be traveling from Mammoth, YNP to Many Glaciers, GNP on September 11, 2013. We will then stay in GNP for 5 days. I would like to take around 6 - 8 hours to get from Mammoth to Many Glaciers. What route would you suggest which is both scenic and takes around 7 hours?
a) 89 to I-90 to 287 to 89?
b) 89 to I-90 to I-15 to 287 to 89?
c) 287 to I-90 to I-15 to 287 to 89 t
d) 287 to 89
e) Something else (Please specify. Extra credit given for reasoning).