Here are the hotels I stayed at in the LV area.

Aladdin
Barbary Coast
Bellagio
Binion's Horseshoe
Buffalo Bill's
Circus Circus
El Cortez
Flamingo Hilton
Four Queens
Fremont
Golden Nugget
Hard Rock
Harrah's
Imperial Palace
Las Vegas Hilton
Main Street Station
New York New York
Orleans
Paris
Plaza
Reserve
Rio
Sam's Town
San Remo
Stardust
Stratosphere
Tropicana
Wynn Las Vegas

Note: The room key at the El Cortez would open your room and anyone else's. All you had to do was slip it in between the door jam and the door... there was a 1/2" gap that would slide the bolt over.

Scott