Have fun!
If I may suggest a few things as I was there last summer. Plan to do things early or late and make the easy things in the afternoon. The temperature fluctuations there are nuts. It'll be like 40's-50's in the night but bloody hot in the afternoon.
Honestly I liked the Tetons MUCH better than Yellowstone. Jackson lake is beautiful and the town is good. I took a float trip on the Snake river and if the weather is nice it's beautiful. Again the afternoon is killer though as on the water it'll make it seem hotter and the rubber raft heats up.
Animals... If it's the same as last year our float guide said the upper part of the Tetons and in between the that and Yellowstone where the road is is probably a good place to see a bear in the early/late hours. Our float guide said a mother bear had had it's cub killed by a male bear so that it would go into to heat. Thus it learned to stay near the road there because the males don't come near the road. I guess he was right because we saw a bear right in that area.
Ohh... also on the float trip there is an eagle's nest along the way.
That's all I've got. Here's me and my sis outside of Lewis Falls:
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