8) YNP is fantabulous! I've spent a total of over a month there. Last summer it snowed, rained, and sleeted, all in one day while we were there. The thing that many people miss is the road from the NE of Yellowstone to Red Lodge, MT thru Bear Tooth Pass. Charles Kuralt said that it is the prettiest drive in the US. It is beyond description.
If you want to dry camp in GNP, Two Medicine Lake is a great place. You camp along a long, narrow lake with a mountain going almost straight up on the other side.