Rio's ultra-lounge attracts a diverse crowd throughout the day for drinks and conversation.. In Short Taking its name from Ipanema in Brazil, this pulsing bar and lounge, decorated with elements evocative of earth, rock and water, invites a passing casino crowd to sip cocktails. During the day, jazzy, Rat-Pack-style tunes play as iconic Vegas images flash on flat screen TVs. In the early evening, downtempo grooves take over and by nightfall, house music pumps throughout the bar. Ten I-Girls, clad in flesh-colored costumes, move to the rhythmic sounds while serving fruity drinks.