NBC Miami – More than 800 slot machines fill the first floor of the Hialeah Park Casino. South Florida’s latest casino is located right beside the historical hotspot Hialeah Park Racetrack on East 32nd Street. Hector Santiago knows the racetrack well. “It’s a change from what it was 30 years ago,” he said. “I used to come to the track here. It looks nice.” Upstairs, it’s a full house in the poker room. With more than 20 tables, managers are already asking for more. Opening at 7 a.m. Wednesday, to a line outside, customers haven’t stopped coming in. So far,…