Rafting

Rafting is a recreational activity which involves using a small boat, known as a raft, to traverse along bodies of water or other liquids.

In 2234, Leonard H. McCoy's cousin, David McCoy, drowned during a rafting trip down the Chattahoochee River on Earth. (TOS novel: Ice Trap).

In 2264, Leonard McCoy rafted down the Colarado River on Earth prior to his appointment to the USS Enterprise as chief medical officer. (TOS novel: Enterprise: The First Adventure).

In 2293, James T. Kirk took up many dangerous pursuits following his retirement from Starfleet. One of those dangerous pursuits were rafting down lava flows. (TOS novel: Crucible: The Fire and the Rose).