If you travel to a foreign city, keep a lookout for people pretending to be police or law enforcement. You should never give anyone your original passport no matter who they purport to be, or you could end up stranded in a strange land. If you are advised that you need to return with them to the police station or another office, travel with them only by foot. Never get into a car with a strange local. You get Bintan Hotel Reservation on this site : http://www.islandbintan.com/bintan-lagoon-resort/.