Yellowstone is only a couple hours away from where I live--it is fabulously beautiful!!! (Steamboat Geyser finally erupted after many years of being dormant, sooo amazing!!!)
I'm so jealous, I live in Florida! I've only seen snow once in my life and I loved it, I've wanted to move up north ever since but haven't been able to afford it quite yet. After watching some stuff on Yellowstone on PBS, especially seeing clips of it in the winter time, I would love to spend part of the holiday season up there.
I would say, win the loterie, or a house, or anything big, but since I have no power over that, it wouldn't fit in a bucket list... so I'd say, get enough in shape to run a half marathon (I can run 5km at the moment...)