Apollo 11 astronaut Buzz Aldrin waves to the crowd before taking his first steps on the Skywalk during the First Walk ceremonies at the Grand Canyon on the Hualapai Indian Reservation, Tuesday, March 20, 2007, at Grand Canyon West, Ariz. The Skywalk opens to the general public on March 28.

People walk on the Skywalk during the First Walk event at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007. The Hualapai, whose reservation is about 90 miles west of Grand Canyon National Park, allowed Las Vegas developer David Jin to build the $30 million Skywalk in hopes of creating a unique attraction on their side of the canyon.

Journalists wearing cloth booties over their shoes to protect the glass, are shown Tuesday, March, 20, 2007, as they look through the glass-bottomed Grand Canyon Skywalk located at Grand Canyon West's Eagle Point in Arizona. Native American leaders, a former astronaut and other visitors stepped gingerly beyond the Grand Canyon's rim, staring into the 4,000-foot chasm below during opening ceremonies.

People walk on the Skywalk during the First Walk event at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007. The Skywalk opens to the general public on March 28. For $25 plus other fees, up to 120 people at a time will be able to look down to the canyon floor 4,000 feet below, a vantage point more than twice as high as the world's tallest buildings.

The Skywalk hangs over the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., prior to a grand opening ceremony, Tuesday, March 20, 2007.

The Skywalk hangs over the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., prior to a grand opening ceremony, Tuesday, March 20, 2007.

The Grand Canyon Skywalk, a glass-bottom observation deck, is photographed Tuesday, March 20, 2007, in Grand Canyon West, Ariz. The glass-and-steel horseshoe extends 70 feet beyond the canyon's edge with no visible supports above or below.

The Skywalk hangs over the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., prior to a grand opening ceremony, Tuesday, March 20, 2007.

Local dancers of the Hualapai Nation perform during First Walk opening ceremonies at the Skywalk at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007. The Skywalk opens to the general public on March 28.

Tyree Koyayesva, 3, left, and Langdon Koyayesva, 5, right, both Hopi and Hualapai Nation members, watch the First Walk ceremonies at the new Skywalk at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007.

Members of the media and invited guests look at the new Skywalk during the First Walk ceremonies at the Grand Canyon on the Hualapai Indian Reservation at Grand Canyon West, Ariz., Tuesday, March 20, 2007. The Skywalk will be open to the general public on March 28.