"Some stupid questions asked of Park Rangers" joke

From the US Parks web site:

Grand Canyon National Park
Was this man-made?
Do you light it up at night?
I bought tickets for the elevator to the bottom -- where is it?
Is the mule train air conditioned?
So where are the faces of the presidents?

Everglades National Park
Are the alligators real?
Are the baby alligators for sale?
Where are all the rides?
What time does the two o'clock bus leave?

Denali National Park (Alaska)
How much does Mount McKinley weigh?

Mesa Verde National Park
Did people build this, or did Indians?
Why did they build the ruins so close to the road?
Do you know of any undiscovered ruins?

Carlsbad Caverns National Park
How much of the cave is underground?
So what's in the unexplored part of the cave?
Does it ever rain in here?
How many Ping-Pong balls would it take to fill this up?
So what is this -- just a hole in the ground?

Yellowstone National Park
Does Old Faithful erupt at night?
How do you turn it on?
When does the guy who turns it on get to sleep?
We had no trouble finding the park entrances, but where are the exits?