Open Question: What are some hikes with great views at Yellowstone National Park?

I'm planning an 8 night trip to Yellowstone in August and would like some advice on which hikes to do. I've been trying to search for trails online but can't find very many pictures of each trail so I'd like your first hand advice.

Which are your favorite hikes?
What are the must see trails?

Thanks for any suggestions! :)

Source:
http://answers.yahoo.com/question/index?qid=20110717203803AAgHRTQ

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