Visit the top casino in National Harbor. You must. As one of the nation's top-awarded casinos, Rocky Gap Casino, Resort & Golf offers multiple award-winning dining, casino, spa, hotel, and bars in Maryland. Disclaimer: Maryland law requires an individual to be 21 years of age or older in order to enter the gaming floor or play video lottery terminals. Ocean Downs Casino: Open 8AM - 2AM, days a year, 7 days a week! Ocean Downs Casino, just 10 minutes from Ocean City, Maryland, has over slot. Enjoy table games, slots, and more at MGM National Harbor casino. General Rules · No purchase is necessary. We reserve the right to verify identification and age of all guests. . · Must be 21 years of age or older to participate. Maryland Law dictates that all casino guests must be 21 years of age to enter. · Drawings will. · Must be present to win. · Prizes are non-transferable. Please play. Book your stay now for the ultimate gaming. Anyone who opts for casino voluntary exclusion will be excluded from entering any Maryland casino, as well as cashing checks and using credit cards in the. 1 MGM National Harbor ; 2 Horseshoe Casino ; 3 Live! Casino and Hotel ; 4 Ocean Downs ; 5 Rocky Gap Casino Resort.