at the correct answers, then, here are my guesses.

1 - Caesar Eats Grapes! - Caesar's Palace
2 - Looks like someone from the Hard Rock
3 - Not sure - Sahara? Some desert slave girl.
4 - Hacienda Horsie?
5 - Howdy Podner! It's Vic from the Pioneer
6 - Thunderbird
7 - Not sure - Last Frontier?
8 - Hotel Apache ?
9 - Glitter Gulch Girl?
10 - Wild Guess - Sands?
11 - Circus Circus
12 - Riviera