Yosemite Valley is like a tourist zoo. It's shameful.

There are too many people coming to parks doing the wrong things. They treat the parks like popcorn playgrounds. They don't understand what the national parks mean.

...a tourist can't help but have a distorted opinion of a place: he meets unrepresentative people, has unrepresentative experiences, and runs around imposing upon the place the fantastic mental pictures he had in his head when he got there.

To sell off a zoo is just unbelievable.

I'm like a tourist when I'm in London.

The two principal parks in Alaska are Denali and Glacier Bay. Tourism is just overriding the protection of resources that tourists want to see. We have too many tourists in Denali and too many big cruise ships in Glacier Bay.