Water skiing was a sport and a recreational activity.
Jennifer Sisko taught her son, Jake, how to water ski on Itamish III. (DS9: "The Jem'Hadar")
In 2373, Lieutenants Tom Paris and B'Elanna Torres made a date to go water skiing in Tahiti on the holodeck on a Friday, as they both had that day off. (VOY: "Waking Moments")