RAPID CITY, S.D. — This summer marks another year where Rapid City's tourism footprint has grown. ADVERTISEMENTThe city also benefited from the the Real America Birthday Bash in Rapid City and the fireworks show at Mount Rushmore with many businesses saying they had their best day of sales ever. "Tourism is essential to Rapid City and to South Dakota as a state," Formanek said. "So tourism is Rapid City's number one industry and there's a lot of businesses that rely on these visitors that come to down every year.