Groupon has several good LV coupons going right now. I would suggest signing up for their daily email.

$10 for One Zip-Line Ride at Fremont Street Flightlines (Up to $20 Value)
Zip Line

$44 for a Five-Hour Luxury-SUV Tour of the Hoover Dam from Guided Vegas Tours ($89 Value)
Tour

$13 for One Premium-Level or Select-Circle Ticket to a Wranglers Game (Up to $38.75 Value). Choose from Four Games.
Wranglers


$15 for Nine Holes of Golf, Cart Rental, and Bucket of 90 Balls at The Callaway Golf Center (Up to a $49 Value)
Golf