A depiction of the real thing, the Grand Canyon is a sim that has lots of activities to offer, some of interest to daredevils.
From zip lining to the bottom,
Hovercraft rides along the river (or various other types of boats), helicopter rides, cannon balling... to the dizzying skywalk.
Watch out for the rattlesnakes and other dangers.
Some areas are managed as romantic getaways.
The sim is rated Mature/Moderate