Lucky you!
We were in Las Vegas this year. We "did" The Grand Canyon as a day trip, to the South Rim. My wife will not countenance light aircraft / helicopters, so we did a bus tour that also took in Hoover Dam and Route 66. It was a LONG day , ( Left at 7am, Hoover Dam about 10:00am, Canyon about 2pm , couple of hours there at 2 different stops and home about 10pm) but in my view worth every minute. Buses aren`t everyones thing so probably best to drive it.
I can only say, DO NOT MISS THE OPPORTUNITY to see the Canyon, however you do it.
Enjoy!
Iain