Rafting
Rafting was a recreational activity in which a person attempted to navigate a rushing river in a raft designed for doing so. 

While surveying an uninhabited planet, 's  noted a gorge on the southern continent that was five times deeper than the Grand Canyon. He suggested that he and Jonathan Archer do "a little river rafting" after they were done performing their survey. ()

See also 
 Kayaking

External link 
 
Recreation
Deleted and unused material in background