If you're ever in Vegas on a Friday night, I have a recommendation for you. First, wait until the sun sets. This is imperative, as I highly doubt the place exists during the day. Drive about 40 miles south of the city, then 6 miles off the highway on a pitch-black, winding road through the desert. Soon you will stumble upon the town of Goodsprings, marked only by its local watering hole, The Pioneer Saloon.
The Pioneer Saloon is currently celebrating its centennial. Perhaps you'll want to take in the night air while playing a game of pool on their sprawling deck. Perhaps you'll simply want to lean against their cast-iron stove and observe the locals, who have all come to sing karaoke. The young woman who knows she looks good in her daisy dukes and high-heeled cowboy boots. The grizzled old biker who riles up the crowd with his renditions of "Because I Got High," "Mack the Knife," and "Copacabana." (You can't make this stuff up.) The friendly bartender with her own microphone. The elderly couple who've just come to take in the show.
You should sing a song, while you're at it. The music selection is overwhelming, and the crowd is more than receptive to strangers. If it's your first time they'll even pour you a free drink in one of their mason jars, and a strong one at that. Don't worry about the drunk woman dancing in front of you while you perform--she's harmless.
If you open yourself to the experience, if you sing and laugh and dance and make friends, you'll leave with lots of hugs and "please come back, now!"s and "drive home safely!"s. Maybe someone will even try to hire you to sing at a party. Forget the glitz of the city; spending the evening in a 100-year-old cowboy bar is the precise definition of a good time.