Concierge.com's insider take:

The phenomenally successful Montreal circus troupe has come a long way since its early days with Mystère and O. Those shows—with their strange costumes, otherworldly music, and astonishing acrobatics—are still running strong (at Treasure Island and Bellagio, respectively), but the troupe broke new ground about five years ago with Zumanity at New York-New York (702-740-6815; www.zumanity.com). Sexy performers with perfect physiques flirt their way through contortion, acrobatic, musical, and comedy acts. It's an erotic show, and not recommended for the easily offended. (On the contrary, couples can request seats on somewhat private red velvet sofas.) For death-defying theatrics, KA, at MGM Grand, utilizes a stage that rises 70 feet into the air and rotates almost perpendicular, leaving the performers to struggle (well, it looks like a struggle) to stay on. It attracts the widest audience with its pyrotechnics, heart-pounding music, and adrenaline rush (800-929-1111; www.mgmgrand.com/ka). Love, at the Mirage, sets imaginary characters to Beatles tracks recorded during the legendary Abbey Road sessions. Beatles fans will go mad, but even younger nonfans find themselves jumping around in their seats (702-792-7777; www.cirquedusoleil.com/love).