Originally Posted by Trijicon
The Gun Shop - shoot full auto assault rifles.
Sunbuggy.com - high speed dune buggies in the desert
Red Square - For martinis
Walk the strip
Cirque De Solei - "O" at the Bellagio (best one in my opinion)
Ferrari & Maserati museum at Wynn
Gamble in Aria
Tomohawk ribeyes at Carnevino in The Palazzo (Mario Batali's steakhouse)
Craftsteak at the MGM (Tom Colicchio's steakhouse)
Hash House for breakfast (off the strip)
+1 do as many of these things as you can. Blue Man Group is a good time as well as others have said.