Dude...you gotta go to the Stratosphere and hop on the new Teeter-totter type ride.
There's this platform hanging 20 feet off the top of the tower, and a cart on the roof, you get in and it raises up...then slides you forward off the tower!!!
You're literally hundreds of feet above nothingness!
I haven't gotten on it yet, it looks awesome though.
Also, make sure to visit Cheetah's, it's a strip club.
If you are really in the mood for a tattoo, visit Starborn Tattoo, near the Sahara casino, my uncle is a tattoo artist there. While at the Sahara, ride Speed - The Ride, it costs $10 for one ride, but an all day pass on it is supposedly just $11. It is a 70 mph coaster, with a 25-feet below ground tunnel, 72 foot loop, and go straight up, then gravity pulls you back down and you ride it again backwards!
All be sure to visit Freemont St. That's where the Las Vegas strip is. The giant awning over the street is awesome, they display all types of images on it.
The Dancing Fountains at the Bellagio are pretty neat.
You just have to go to the Rio for buffet, it's one of the most expensive at $17 a plate, but you have food choices from all over the world, including home favorites like corndogs, hotdogs, pizza, etc. All you can eat!!!
You can also go out past the city limits and find tons of Whore Houses...