We really like the Lamar Valley for seeing animals.
We tented it at Slough Creek and Pebble Creek a numbers of times and loved those places. Tough to get a spot anymore though unless you arrive early or at just the right time.
Bring warm clothes and sleeping bags for evenings/nights.
Mosquito spray can be real handy for some areas.
Bring optics, a spotting scope is real nice also if you want to see game.
If you're going to hike much, which I recommend, some bear spray might be worth having along.
Take your time. Don't rush, soak it in.
