Las Vegas changes quickly so for your reference note that the following attractions are closed:

Nevada Zoological and Botanical Park (closed)

The Sirens of TI

"Race for Atlantis" Imax Ride

Cinema Rides at Caesar's Palace Hotel

Cyber Speedway at Sahara Hotel

Lion Habitat at MGM

Wildlife Habitat at the Flamingo

Speed the Ride rollercoaster at Sahara

Star Trek Experience at the Las Vegas Hilton

Liberace Museum

Pirates 4D at Luxor