Easily Yellowstone and there's plenty of waterfalls there. fly into Jackson Hole, its an awesome place that is a classic scene out of the old west. Explore the beautiful Grand Tetons, then head up to Yellowstone. The scenery will take your breath away, the geysers will impress you, and the wildlife is some of the best on the planet. There is something for everyone here. There are grand hotels to relax in, a lake for fishing trips, and plenty of trails for hiking and horseback riding. You can see grizzly and black bears, wolves, coyotes, elk, moose, antelope, and bison just to name a few creatures. Visit www.yellowstone.net to help plan your trip. Also make sure you visit the discussion forum there to see pictures, reports, and get advice from regular park visitors. It is a magical place you will never forget and immediately want to go back to. There is something about Yellowstone that gets inside of you.
You will never forget sitting in a green mountain valley, watching a herd of bison cross a river, with wolves howling in the background.
went 2 years ago and loved it