The advertisement for a Caribbean hotel touts “ocean view,” and there is—for guests who climb to a rooftop terrace and peer far into the distance. A restaurant website is replete with rave reviews that give no hint they were written by people who were paid for their positive ratings. The photograph shows people enjoying a nearly deserted beach that, in reality, is usually is packed with other sunbathers. When it comes to making travel plans, whether you’re picking a destination, place to stay or eat, or handling other arrangements it’s wise to keep in mind that tried-and-true adage, “If it sounds too good to be true, it probably is.” While the majority of travel-related ads and reviews are legitimate, a surprising number aren’t. Research by the University of Illinois and BestSEOCompanies.com, a firm that helps businesses select the best search engine optimization vendors, suggests that as many as 20 percent …