We didn't camp out we went up about an hour before maybe and we were fine..right behind the people in the chairs who camped out.
Now, the problem was the people who came much later..trying to squeeze in..that was horrible. I had some man standing so close to me..I mean..right up against my back sweating all over me, it was disgusting. Couldn't believe it.
For the second two locks the best view is from your port side stateroom balcony, if you have one. Not sure what the starboard side shows.
The canal is totally amazing.
Also..the entire thing is shown..entering, going through the locks, etc..on your stateroom tv. So between that and our balcony, we didn't miss anything. It was excellent.
Enjoy your cruise..it is totally fantastic..and the food..well, it rivaled any 5 star restaurant food you could have!