A tourist is someone who visits a location for leisure or business purposes.
In early 2369, Quark complained about the lack of tourists visiting Deep Space 9 from the Gamma Quadrant because neither the Tosk or the Hunters bought a drink in the bar. (DS9: "Captive Pursuit")
In 2374, Nog assured Jake Sisko that he would have plenty of time "to play tourist" on Ferenginar, while he was delivering a message to Grand Nagus Zek from the Federation Council. (DS9: "Valiant")