Dubai's biggest business these days is tourism. And one of the most popular tourist activities is the Desert Safari. The group from the Chester County Chamber of Business & Industry took one Thursday and the day included camel riding, an adventurous ride across sand dunes in  four-wheel drive vehicles that can leave visitors wondering what is up and what is down,  a barbeque dinner and a display of traditional dancing.The group also stopped at a traditional Dubai shopping mart on their way to their desert activities to test their hand at bartering. As usual, the sun beat hot Thursday, when tghe heat was decidedly not dry.