Urgent: What´s the meaning of "Lounge Lizard Heaven"?

I´de be really grateful if anyone could tell me the meaning of Lounge Lizard Heaven

Here´s the context in which the expression appears:
..
"Once known as the last stop before lounge lizard heaven, Vegas is now a mecca for entertainers and other major events."
..
What does it exactly mean?
Thanks in advance,

Mirela
Rosario, Argentina

Las Vegas is a city in the state of Nevada here in the US of A.
At one time Las Vegas was a run down, crime infested area of cheapo, run-down hotels, saloons and crooked gambling establisments populated by transients, hookers and gangsters from New York and Kansas City.
The people who frequented and worked at these places are/were called "lounge lizards", another name for a sleazy person.
Now Las Vegas is a family tourist destination with the entertainment now more like a Disney theme park.
So "Longe Lizard Heaven" was a description of Las Vegas before it's renaissance.