I can see two that could be both pool related and before I moved there, and one that could be both pool related and chip related.

20th Century--Before I moved there
Caesars Palace--Pool related
Dunes--Before I moved there
El Morocco--Before I moved there
Excalibur--Grand opening
Hacienda--Pool related
Hard Rock--Grand opening
Holiday--Before I moved there
Horseshoe--WSOP related
Imperial Palace--Pool related
Landmark--Before I moved there
Luxor--Grand opening
MGM Grand (Now Bally's)--Pool related
MGM Grand--Grand opening
Mirage--Grand opening
Orleans--Chip related
Union Plaza--WSOP related
Riviera--Pool related
Royal Inn--Before I moved there
Sahara--Pool related
Sands--Before I moved there
Showboat--Pool related
Silverbird--Before I moved there
Treasure Island--Grand opening
Treasury--Before I moved there
Tropicana--Chip related

Stayed at the most times--Riviera

Bob