Oh, Ranger!

National Parks are extremely well organized in the US, at least from what I’ve seen. When you arrive you can pick up an “Oh, Ranger!” brochure that will provide you with all of the information that you may need: what to see, what to do, where to sleep, where to eat, a map, any watch tip or watch out... anything you need for a successful trip.
And I have to say that they are pretty well done and turned out very useful.