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):

• What time do you feed the bears?
  
• Can you show me where the yeti lives?
  
• How often do you mow the tundra?
  
• 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?
  
• Why did the Indians decide to live in Colorado?

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?

Yosemite National Park:

• Where are the cages for the animals?
  
• What time do you turn on Yosemite Falls?

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?