The Strip - Free things to do!

• Circus Circus 
• Inside, they do some sort of acrobats/carnival shows. It's quite frequent!
• Mirage
• Volcano show at 7 and 8 PM everyday.  
• Mandalay Bay
• Aquarium "The Reef"
• Flamingo
• Flamingos and there seems to be a black swan (couldn't find it though) and there is a Koi pond too.

• Bellagio
• The fountain (it plays frequently)

• The Conservatory
• They change the decorations every season

• Treasure Island
• "Sirens" of the Treasure Island (unfortunately, cancelled)
• Venetian
• Music and Opera Singers at the St. Mark's Square (Streetmosphere Performance)

• Wynn
• Displays near the central area

• M&M
• Free 3D Movie at the 3rd floor