Nice shots!
I was there as well...freakin fences everywhere are a nightmare for taking pictures. I actually sat in the SW Vista towards the top (high enough to shoot over the giant fence) and shot with a 7D, 400 5.6L paired with a 1.4TC (taped pins). Even with all that reach, and the autofocus working really well, I still can't crop them as much as I would like. I would have needed a 400 2.8L with a 2xTC....
Next year I'll spend more time going to a few of the decent places to take pictures around there. My bro-in-law is really into bikes, so I was sorta just along for the ride.