Linklord there is a ton of stuff to climb up on. Carts... Wagons, little stands etc. Also if you are close enough you can get on the slaver wagons or the Arena.
For those that don't understand the arena. As I mentioned its a giant wooden dome that people can climb on. Here is some pics of what it would look like, only bigger...
By the way, the Hunchback is near some guards and a bunch of slaves that are pulling something up from underneath the Arena. what ever it is seems to be hard to pull up, the slaves are straining.
i've given more info about that in PM's, so thats all i will say here.