Nice photos! Buffalo, bison, whatever you want to call them, are fun to watch. We have one of the most genetically pure herd out here in California on Camp Pendleton. So much so, that some have talked about plucking a few out of the herd to repopulate some other areas of the west.
They are really taken care of too. They will wander around the rifle ranges, adn all shooting must cease immediately. You can't harrass them in any way. They actually come up and use our reloading tables as rubs. We'll find clumps of hair hanging from them, and they lay some of their own "land mines"...
They are free ranging but inside the park and will let you snap picture after picture of them. Now if you want to see a true wild bison that will usually run the first time that he sees you and some of the largest mule deer bucks in the western US I can give you a location. Not only are they free ranging but you can put in for a draw to hunt them.
The one in my avatar was such an animal. His only problem was that he didn't make it through the hunt 3 months after I took his picture. That along with having a busted horn from fighting a month before.
Try to put your tree stand in a tree with plenty of background cover, keep the prevailing winds for that time of the year to your face, and take care of those pesky squeaks and creaks your stand may have developed while sitting in the shed. A good treestand lube can be made by heating petroleum jelly until it reaches a liquid form. Some hunters have reported success by including a cover scent in this mixture before applying it to their stands.