Instead of showing travelers why they should visit Missouri, the state is letting tourists do that themselves. The Missouri Division of Tourism earlier this month launched "It's Your Show," a new $500,000 advertising campaign that armed six family and friend groups with GoPro cameras and iPhones to let them shoot their experiences in Missouri. "We wanted to do something fresh and authentic," said Mark Manion, executive creative director at H&L Partners, the marketing agency for the state's...