The only thing I can think of that I didn't have was a small portable stool. The small 3 leg ones. LIke I said where we were getting prone wasn't an option and I'm not flexible enough to comfortably sit on the ground behind my tripod/shooting sticks. I was always looking for a rock seat and it would have been better if I had my own seat. When I was there I found a foam seat to put on the rocks while glassing, so I would recommend that.
Bring more water than you think you will need.
Tweezers, you will most likely be pulling a few thorns from your hands, arms and legs. Multi-tool is not a very good pair of tweezers. Ha.
Good luck!
TexAgs: as long as we have each other, we will never run out of problems.