It's been 11 years since my last visit in 2005 so things may have changed a little. I second taking time to also visit Grand Teton NP, particularly if you are driving in or out from the south. I really enjoyed Jenny Lake campground and also visiting the nearby Lodge. A short boat ride across the lake and some easy hiking on the west side was also nice. As I recall (???) trails go around the lake so you can do as much or as little hiking as you want.
You can't go wrong with any part of Yellowstone as far as I'm concerned. It's all awesome. You just need to allow plenty of time to see and take in all the unique sites. Our visits have been in May or late August/early September to avoid summer crowds, so we got to see a lot in 3 or 4 days. If I went back now I'd plan to stay at least a week -- there is so much to see.
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