Go to the South Rim [1], stop at one of the visitor centers [2], see the sights at Grand Canyon Village [3], hike along the Rim Trail [4], and explore Hermit Road [5].
Add Desert View Drive [6] and, if it’s summer, spend a couple of days on the North Rim [7] or take a mule trip [8] to Phantom Ranch [9] in the Inner Canyon [10].
Add a visit to Havasu Canyon and Supai Village, or sign up for a rafting trip [11] through the Inner Canyon [10].
Raft the length of the canyon and spend a few days exploring the North [7] and South Rims [1], including scenic drives [12] and hikes [13].
Links:
[1] http://www.moon.com/destinations/grand-canyon/the-south-rim
[2] http://www.moon.com/destinations/grand-canyon/south-rim/exploring-south-rim/visitor-centers
[3] http://www.moon.com/destinations/grand-canyon/the-south-rim/sights/historic-grand-canyon-village
[4] http://www.moon.com/destinations/grand-canyon/the-south-rim/recreation/hiking/rim-trail
[5] http://www.moon.com/destinations/grand-canyon/south-rim/exploring-south-rim/driving-tours/hermit-road
[6] http://www.moon.com/destinations/grand-canyon/the-south-rim/exploring-the-south-rim/driving-tours/desert-view-drive
[7] http://www.moon.com/destinations/grand-canyon/the-north-rim
[8] http://www.moon.com/destinations/grand-canyon/south-rim/exploring-south-rim/tours/mule-trips
[9] http://www.moon.com/destinations/grand-canyon/inner-canyon/sights/phantom-ranch
[10] http://www.moon.com/destinations/grand-canyon/the-inner-canyon
[11] http://www.moon.com/destinations/grand-canyon/inner-canyon/recreation/river-running
[12] http://www.moon.com/destinations/grand-canyon/south-rim/exploring-south-rim/driving-tours
[13] http://www.moon.com/destinations/grand-canyon/the-south-rim/recreation/hiking