He is green. He wears a brown suit, and a moderately small hat, and holds a brown briefcase.
Patrick is gave an advertisement for him to take a vacation, given by this man, and he thinks the phrase, "Get Outta' Town" means that he has to leave Bikini Bottom, though he was only offering a Beach Resort Vacation. He ends up thinking that SpongeBob and Patrick are mindless.
He most likely works, or lives around a Sunny Shore Resort.
Patrick originally referred to him as "The guy with the briefcase."
In the DS version of SpongeBob's Truth or Square, the sailfish appears in SpongeBob's pineapple house. If the player tabs on the salesfish using the stylus, he offers you goodies which cost a certain number of happy points.