re: Yellowstone

I personally enjoy Grand Teton national park more than Yellowstone. That being said, going to Yellowstone at least once in your life is worth it. You want to stay in Yellowstone for the best experience. Cabins book up fast, not too sure about the camp sites.

There is a lot of driving in Yellowstone. Speed limits are slow and roads are crowded.

Bring a decent pair of binoculars. I forgot mine last summer and ended up buying an overpriced set in Jackson Hole.

Also, be prepared to walk a lot. That is the only way it is really worth it. At Ol' Faithful there is a trail that I think is about 2.5 miles one direction. So many people don't do this, but they really should. Not only do you get to see so much more, these areas are going to be less crowded.