Just one. Don't go to Las Vegas
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Seriously though, the Hoover dam is just a short drive from the strip, and if gambling and showgirls aren't your thing you could stay in Henderson or Boulder City for a lot cheaper and only be 20-30 minutes away.
The 'Old Strip' in Las Vegas was... well kinda grimey when I was there last, so I would stay away from there.
Vyris