Definitely going to try and hit up Antelope Canyon, looks amazing. (Incidentally, was 127 hours shot around here, photos of the place look straight out of that movie?).
The thing I have to decide is whether to visit Uppor Antelope Canyon, Lower Antelope Canyon, or both?
I guess one factor that could influence my decision is price (I have no idea how much either costs).
I think I'm more concerned, though, about the crowds that might be drawn to the Upper Antelope Canyon, which I understand is the more popular canyon. Seeing as my friend and I are going in the middle of summer, is Upper liable to jam-packed full of people? I'm a bit of a city slicker, tbh, but when I'm there at Antelope Canyon I'd prefer to hear my own thoughts (and the words of wisdom imparted by a wise old Navajo guide) rather than screaming kids and - without wanting to sound like an old Scrooge (I'm 23!) - obnoxious tourists.