You can Google the words "Grand Canyon" and "helicopter" and find numerous companies that provide these day trips. They offer tours by charter bus, helicopter or small plane. When you get there you can hop in a Hummer or on a pontoon boat, peer over the new Grand Canyon Skywalk or have a picnic lunch and a champagne toast.
We chose the Papillon Grand Canyon Helicopter Tours unique option to fly there via helicopter, land on the canyon floor, enjoy a picnic lunch and walk around. An added bonus was that a shuttle provided hotel-door-to-airport-hangar-door service.
The only thing to worry about was the possibility of airsickness. (Dramamine to the rescue.)
Papillon has been around since 1965 and takes up to 7,000 tourists to see the Grand Canyon each month. Our shuttle deposited us to the nearby Boulder City Airport — yes, the city created for the workers who built the Hoover Dam — where we and others huddled to watch a safety video and wait to be assigned to a helicopter.
The 30 or so who waited with us were from England, Spain, Holland and Australia, as well as cities across the United States.