MGM Grand

The 5,000-plus-room ode to Emerald City on the south end of the Strip is massive. Home to some of the world's top chefs (Robuchon, Puck, Colicchio, Lagasse), MGM Grand also has partnerships with Hakkasan, which runs its spectacularly large club; Wet Republic, one of the most popular pool clubs in Las Vegas; and dozens and dozens of bars, retail venues, restaurants, swimming pools and Cirque du Soleil production Kà. But MGM isn't just about size. A renovation in 2012 also brought 42 "Stay Well" rooms completely devoted to purifying the air, detoxing your body, and even eliminating sleep-disruptive electromagnetic fields.