Hey, I lived in Estes Park, CO - that place is also a mad mess in the summer due to Rocky Mtn N P. I avoid Zion. I love the drive in from the east; best part of the whole park. I get a very stiff neck sitting on a bus looking up going down the canyon. It is quite good from a hiking standpoint but, IMHO, that is about all. Much prefer Bryce or Capitol Reef.